Sometimes I am unable to close KeepassXC. Seems to be when I have Hibernated the PC then restarted it, Not unlocked after restart. Shutdown by right-click in tray icon and select Quit. Process hangs and has to be terminated via Task Manager. Problem appeared in 2.5.1 and all subsequent releases so I'm running 2.3.4. I'm running the Portable version - don't know if that makes any difference.
Doesn't always happen but it is very annoying when it does.
Windows 10 .
By the way - the 2.5.3 release says it's 2.5.1 on the 'About' pop-up.