Not getting new messages
Around Jan. 4, I tried moving all of my Inbox contents to a new subfolder "Inbox 2025". This process was taking a long time and I didn't see it complete. Afterwards, I can start Thunderbird OK (version 115.3.1 (64-bit) running on a Windows 10 system). I see the new folder "Inbox 2025" and it seems complete. I also see other folders which look OK. But the incoming messages have frozen at 01/01/26 [for one e-mail account] and at 01/04/26 [for a second e-mail account.]
It is also true that all of my Thunderbird sessions end by crashing after a certain period of time. What can I do to restart Thunderbird so that it will connect with the relevant servers, get new messages and not crash?