SUMMARY
After KDE has been open for a while (not sure the exact time frame, maybe the better part of a day.) it will "fall asleep" and other devices will no longer see it as available until I click the tray icon and open the main window again.  It'll then stay active for a while, until it "falls asleep" again.  This is particularly annoying if I've been lying on my bed on my phone and want to send a link/file/whatever to my computer to look at once I get up.

STEPS TO REPRODUCE
1. Open the app.
2. Wait a while.
3. Try to send a file from another device.
4. Notice that the Windows device(s) are missing.
5. Get off your sweaty bum and walk over to the Windows device(s) in question.
6. Click the tray icon to open the main window.
7. Refresh the list on the other device and notice that the Windows device(s) are now available.
8. Become annoyed.

OBSERVED RESULT
Windows clients aren't available after a while, causing me to have to get off my butt and go fix it.

EXPECTED RESULT
Windows clients (or any client) should be available at all times, so that I can use any of the plugins at any time, instead of needing to go and "wake up" the client, at which point I might as well just do whatever action from there.

SOFTWARE/OS VERSIONS
Windows: Version 21H2 (OS Build 19044.1586)
There isn't a way to view the version number in the Windows version, as far as I can tell, but I have JUST updated it from the Windows Store a few days ago.  So it should be the latest version as of this post.