I'm using a Mac with OS 11.7.9, Thunderbird 115.7.0, my provider is Earthlink. There has been a problem recently where Thunderbird won't download my messages. I open Tbird, log in and the blue bar at the bottom stays on for a while then goes off, no email. If I hit the cloud button in the upper left corner of my Tbird window, it shows my email at the bottom of the screen, says downloading from host. It sometimes just shuts down, or will show how many messages there are to download and then shuts down, or shows the number of messages to download with the blue light bar at the right at the bottom of the page just scrolling without downloading the messages. Usually it just shows it has contacted the host, shows the number of messages it is going to download and just turns off in a few seconds. I tried clearing out messages from the Earthlink Webmail, in case there was a message causing the error, cleared a bunch of messages out of my Tbird inbox, deleted the messages built up in trash, cleared the caches of both Tbird and Firefox. I've used Tbird for years on the same computer I'm using now. Had this same problem a couple weeks ago, took a number of the same steps as per above, shut the computer down and restarted and Tbird was operating normally again until yesterday where the same problem started up again.