Check your logins. I suspect the Lad is getting up ahead of you, checking the email, then deleting things that might divert you attention from him.
All logins ok ? strange. No way is the lad up ahead of me, winter has set in and he hides under his duvet as long as possible.
I stop receiving notifications for few days, then I noticed that I marked one of the OF mails as spam by accident, and gmail was sending them all to the spam tray.
Hmm interesting it could be that when the server ip changed emails were flagged as spam for a while, I'll investigate that a little further today