Please send a screenshot of any error messages that you are receiving. Errors such as this are often Third Party Anti-Virus related so starting in Safe Mode with Networking (you don't specify if you are running a Windows OS) can be a diagnostic to see if there is software running that is causing the problem.

Hi Here are my stats. I am running Windows 11. I am using Bitdefender, Ccleaner and AVG Tuneup. I have no error messages to show you. I just have to close Thunderbird and reopen to get my emails. Also still having problem with filtering spam email (from another question I asked) Any more help would be greatly appreciated. Thanks!!

Update on my message above. I am running Thunderbird 128.6.1 esr 64-bit. Also I am running a dedicated VPN IP Address through Surfshark. Need anything more, just let me know.

Bitdefender has been causing numerous issues. See https://support.mozilla.org/en-US/questions/1486677

Thanks for getting back to me. I will look into Bitdefender and see about excluding Thunderbird from it. Will get back to you either way. What about my prior email about filtering spam. I sent a pic of my filtering setup for @live.com. But still getting a lot of spam from that address.

Update at 3:05 pm EST. No email received for a while and so closed and reopened Thunderbird. 3 emails arrived one 4 hours old. Not sure if I has set up Bitdefender correctly. As an exception I used the link that opens up Thunderbird. If there is something else I need to do, please let me know. Thanks

UPDATE: I added the Exception to Bitdefender. I am also sending information to Xfinity/Comcast different than in the past. So far today 1/29/2025 I have had no problems. So I am going to close this request. Thanks for your help!!