When I open Thunderbird, new emails download fine from multiple accounts (from 3 different ISPs), but after a time which varies, Thunderbird no longer fetches new emails and even the cloud icon (Get Messages) no longer works forcing me to close and reopen Thunderbird which then will download new emails again.. I checked settings, and all look fine. I have used Thunderbird for many years and this is the first time it has happened. Any ideas? Using Windows 10 Home 19045.5011, Thunderbird 128.3.1esr (64-bit). Any help appreciated