I’ve been using EMC for years and this problem suddenly started a couple weeks ago.
It goes offline and will not send or receive but the red triangle does not show suggesting it thinks it’s online and there’s no way I can find to force it online. My only indication is mail stalls in my outbox. If I exit the program and bring it back it’s totally fine. It seems to happen after not using the computer for a period of time and/or if I enter sleep mode (desktop).
I do not use Windows Firewall, Defender (forced off in Windows policy) or any third party security software. I trust my router and myself.
Really strange, I use Hibernate & Sleep and have never had the problem on my main laptop, however, it sometimes happens on my test machine.
Main computer is running Windows 10 Pro Workstation 1909
Test machine is running Windows 10 Pro 20H2