Was a factory reset performed before and after updating FW, then set up from scratch?
No, I didn't perform a factory reset as I wanted to avoid reconfiguration and that's why I posted here. However, I would be willing to do that if I knew it will solve the issue. If no other solution is offered I will try that as well.
BTW, another info that evaluates that the probles lyes in the motion detection and not in the email procedure is that at the time that emails stopped to be sent, local recording on sd card also stopped so it's totally irrelevant to other factors. It's clearly device issue.
Do you believe a factory reset and re-setup would solve this?