Hello,
I suspect some third party buggy software installed on your PC interfering with FDM.
You can help us to find the exact reason by doing the following steps:
1. Wait for FDM to freeze.
2. Now you need to be fast enough. :) Open Task Manager, Details tab. Find fdm.exe process there. Right click on it and choose [i]Create dump file[/i] menu. The dump must be created while FDM is still not responding, or it will be useless otherwise.
3. Send this dump file to me. You can upload it somewhere (e.g. https://anonfiles.com) and send me the link to it via the private message on this forum.

Follow the hints described in the topic linked below, please:
https://www.freedownloadmanager.org/board/viewtopic.php?f=1&t=18611

FDM is sometimes and randomly freezing and lagging... even with no active downloads, nothing in download list, it stops responding during some seconds/minutes. If downloads are active, they crashes.

Nothing wrong in the logs except things like :

[code]
[2023-03-08T13:34:28.442][t:7396] Free Download Manager, version: 6.18.1.4920, cpu arch: x86_64, abi: x86_64-little_endian-llp64
[2023-03-08T13:34:28.442][t:7396] OS: Windows 7 SP 1 (6.1), version: 7sp1, kernel version: 6.1.7601, cpu arch: x86_64
[2023-03-08T13:34:28.442][t:7396] Command line arguments: C:\Program Files\Softdeluxe\Free Download Manager\fdm.exe
[2023-03-08T13:34:28.452][t:7396] [AppModule]: initializeSelfBefore(1) started
[2023-03-08T13:34:28.453][t:7396] [AppModule]: initializeSelfBefore(1) finished
[2023-03-08T13:34:28.453][t:7396] [AppSingleInstanceManagerModule]: initializeSelfBefore(1) started
[2023-03-08T13:34:28.455][t:7396] [AppSingleInstanceManagerModule]: initializeSelfBefore(1) finished
[2023-03-08T13:34:28.455][t:7396] [AppSingleInstanceManagerModule]: initializeSelfAfter(1) started
[2023-03-08T13:34:28.455][t:7396] [AppSingleInstanceManagerModule]: initializeSelfAfter(1) finished
[2023-03-08T13:34:28.455][t:7396] [AppCore]: initialize(1) started
[2023-03-08T13:34:28.470][t:7396] [AppCore]: initialize(1) finished
[2023-03-08T13:34:28.471][t:7748] [AppNetworkCore]: initialize(1) started
[2023-03-08T13:34:28.492][t:7748] [AppNetworkCore]: initialize(1) finished
[2023-03-08T13:34:28.493][t:4168] [AppIntegrationModule]: initialize(1) started
[2023-03-08T13:34:28.493][t:4168] [AppIntegrationModule]: initialize(1) finished
[2023-03-08T13:34:28.493][t:7748] [AppRemoteControlCoreModule]: initialize(1) started
[2023-03-08T13:34:28.574][t:7748] [AppRemoteControlCoreModule]: initialize(1) finished
[2023-03-08T13:34:28.574][t:7748] [AbstractDownloadsModules]: initializeSelfBefore(1) started
[2023-03-08T13:34:28.576][t:7748] [AbstractDownloadsModules]: searching built-in modules...
[2023-03-08T13:34:28.576][t:7748] [AbstractDownloadsModules]: target folder: C:/Program Files/Softdeluxe/Free Download Manager
[2023-03-08T13:34:28.580][t:7748] [AbstractDownloadsModules]: downloadsbatch.dll: YES
[2023-03-08T13:34:28.592][t:7748] [AbstractDownloadsModules]: downloadsbt.dll: YES
[2023-03-08T13:34:28.592][t:7748] [AbstractDownloadsModules]: downloadsjsp.dll: YES
[2023-03-08T13:34:28.596][t:7748] [AbstractDownloadsModules]: downloadsm3u.dll: YES
[2023-03-08T13:34:28.597][t:7748] [AbstractDownloadsModules]: downloadsms.dll: YES
[2023-03-08T13:34:28.599][t:7748] [AbstractDownloadsModules]: downloadswww.dll: YES
[2023-03-08T13:34:28.599][t:7748] [AbstractDownloadsModules]: initializeSelfBefore(1) finished
[2023-03-08T13:34:28.599][t:7748] [AbstractDownloadsModules]: loaded modules pack (): count: 4
[2023-03-08T13:34:28.599][t:7748] [AbstractDownloadsModules]: initializeSelfAfter(1) started
[2023-03-08T13:34:28.599][t:7748] [AbstractDownloadsModules]: initializeSelfAfter(1) finished
[2023-03-08T13:34:28.601][t:7396] [IncomingDownloadsModule]: initialize(1) started
[2023-03-08T13:34:28.601][t:7396] [IncomingDownloadsModule]: initialize(1) finished
[2023-03-08T13:34:28.601][t:7396] [AppCore2]: initialize(1) started
[2023-03-08T13:34:28.601][t:7396] [AppCore2]: initialize(1) finished
[2023-03-08T13:34:28.602][t:7396] [BannersModule]: initialize(1) started
[2023-03-08T13:34:28.602][t:7396] [BannersModule]: initialize(1) finished
[2023-03-08T13:34:28.602][t:7748] [AppPluginsModule]: initialize(1) started
[2023-03-08T13:34:28.602][t:7748] [AppPluginsModule]: initialize(1) finished
[2023-03-08T13:34:28.603][t:7748] [DmCoreModule]: initializeSelfBefore(1) started
[2023-03-08T13:34:28.604][t:7748] [DmCoreModule]: initializeSelfBefore(1) finished
[2023-03-08T13:34:28.604][t:7748] [DmCoreDownloadsModule]: initialize(1) started
[2023-03-08T13:34:28.604][t:7748] [QtUsingAllowedNetworkMonitor]: switchedOn: 1
[2023-03-08T13:34:28.612][t:7748] [QtNetworkOnlineStateMonitor]: online: 1
[2023-03-08T13:34:28.640][t:7748] [DmCoreDownloadsModule]: initialize(1) finished
[2023-03-08T13:34:28.640][t:3724] [DmCoreMiscDiskTasksModule]: initialize(1) started
[2023-03-08T13:34:28.644][t:3724] [DmCoreMiscDiskTasksModule]: initialize(1) finished
[2023-03-08T13:34:28.644][t:7748] [DmCoreModule]: initializeSelfAfter(1) started
[2023-03-08T13:34:28.644][t:7748] [DmCoreModule]: initializeSelfAfter(1) finished
[2023-03-08T13:34:28.645][t:7396] [AppAbstractUiBackendModule]: initialize(1) started
[2023-03-08T13:34:28.777][t:7396] [AppAbstractUiBackendModule]: initialize(1) finished
[b][color=#FF0000][2023-03-08T13:34:28.778][t:7396] PERFORMANCE WARNING: Too slow task (TASKS/App Start/App Modules Init/UiBackend; duration: 132ms)[/color][/b]
[2023-03-08T13:34:28.781][t:7748] [AppRemoteBackendServerCoreModule]: initialize(1) started
[2023-03-08T13:34:28.781][t:7748] [AppRemoteBackendServerCoreModule]: initialize(1) finished
[2023-03-08T13:34:28.781][t:7748] [AppRemoteControlServerModule]: initialize(1) started
[2023-03-08T13:34:28.782][t:7748] [AppRemoteBackendServerModule]: initialize(1) started
[2023-03-08T13:34:28.782][t:7748] [AppRemoteBackendServerModule]: initialize(1) finished
[2023-03-08T13:34:28.782][t:7748] [AppRemoteControlMasterServerClientModule]: initialize(1) started
[2023-03-08T13:34:28.784][t:7748] [AppRemoteControlMasterServerClientModule]: initialize(1) finished
[2023-03-08T13:34:28.785][t:7748] [AppRemoteControlServerModule]: initialize(1) finished
[2023-03-08T13:34:28.785][t:7396] [AppAbstractUiDirectlyConnectedFrontendModule]: initialize(1) started
[2023-03-08T13:34:28.786][t:7396] [AppAbstractUiDirectlyConnectedFrontendModule]: initialize(1) finished
[2023-03-08T13:34:28.786][t:7396] [AppUpdatesModule]: initialize(1) started
[2023-03-08T13:34:28.789][t:7396] [AppUpdatesModule]: initialize(1) finished
[2023-03-08T13:34:28.789][t:7396] [AppUiCore]: initialize(1) started
[2023-03-08T13:34:28.789][t:7396] [AppUiCore]: initialize(1) finished
[2023-03-08T13:34:28.789][t:7396] [UiFrontendIncomingDownloadsModule]: initialize(1) started
[2023-03-08T13:34:28.789][t:7396] [UiFrontendIncomingDownloadsModule]: initialize(1) finished
[2023-03-08T13:34:28.791][t:7396] [AppUiCore2]: initialize(1) started
[2023-03-08T13:34:28.791][t:7396] [AppUiCore2]: initialize(1) finished
[2023-03-08T13:34:28.791][t:7396] [AppRemoteFrontendServerModule]: initialize(1) started
[2023-03-08T13:34:28.791][t:7396] [AppRemoteFrontendServerModule]: initialize(1) finished
[2023-03-08T13:34:28.791][t:7396] [CppQmlModule]: initialize(1) started
[2023-03-08T13:34:28.793][t:7396] [CppQmlModule]: initialize(1) finished
[2023-03-08T13:34:28.793][t:7396] [AppQmlModule]: initialize(1) started
[2023-03-08T13:34:32.375][t:7396] [AppQmlModule]: initialize(1) finished
[b][color=#FF0000][2023-03-08T13:34:32.375][t:7396] PERFORMANCE WARNING: Too slow task (TASKS/App Start/App Modules Init/Qml; duration: 3581ms)[/color][/b]
[2023-03-08T13:34:35.226][t:7396] [AppMiscUiModule]: initialize(1) started
[2023-03-08T13:34:35.321][t:7396] [AppMiscUiModule]: initialize(1) finished
[2023-03-08T13:34:35.357][t:7396] [QtAppSystemNotificationsModule]: initialize(1) started
[2023-03-08T13:34:35.357][t:7396] [QtAppSystemNotificationsModule]: initialize(1) finished
[2023-03-08T13:34:35.358][t:7396] [AppNotificationsModule]: initialize(1) started
[2023-03-08T13:34:35.358][t:7396] [AppNotificationsModule]: initialize(1) finished
[2023-03-08T13:34:35.358][t:7396] [AppModule]: initializeSelfAfter(1) started
[2023-03-08T13:34:35.358][t:7396] [AppModule]: initializeSelfAfter(1) finished
[b][color=#FF0000][2023-03-08T13:34:35.358][t:7396] PERFORMANCE WARNING: Too slow task (TASKS/App Start/App Modules Init; duration: 6906ms; excluding nested tasks: 2906ms)
[2023-03-08T13:34:35.358][t:7396] PERFORMANCE WARNING: Too slow task (TASKS/App Start; duration: 6921ms; excluding nested tasks: 14ms)[/color][/b]
[/code]

Why is it behaving like this ?!