You didn't happen to download nemo? Even after I deleted it the gallery was busted. Every time I would open gallery I would lose my synch until after reboot. All fixed now though.
Mine recently started doing the same thing. I have been on BB 1.1 for a while now. I got my emails at first, now they are not coming through. I have not made any big changes to my device recently.
The same thing was happening to me after installing latest BB version. my default email is through att.net and I read it all through Gmail. I re-input my att.net email settings on my phone(Droid) and now Gmail is refreshing again automatically.
My email has also stopped auto-fetching, and I too am running BB 1.1. Weird, I'll try to re-enter my account info and see if that does it. I've been checking it with the default Email client (not Gmail).