I've been using Thunderbird for decades. I have Thunderbird set to automatically download messages every 5 minutes. Platform: Computer Win11 Home, Thunderbird 128.10.0esr (64-bit), POP3 connection (also with IMAP connection on a MacOS computer. But a new issue is now occurring. Every so often now, I realize I haven't received any new email downloads in some time. I click on the Get Messages button (or right-click and select items individually), but nothing happens - no "Host Contacted..." message in the Status Bar. It's like the Get Messages function is completely disabled. It is only when I quit then restart Thunderbird does it successfully establish a connection and download the many queued emails. Please let me know if this is a known bug, or if there is a way to submit this as a bug. Also let me know of any other information you would need in order to help debug this issue. Thanks!