[shaggylive]

my first guess is a loose or bad battery. I have one battery that is slightly smaller than the others and if it gets bumped just right it would do the same. I fixed by putting a couple of small dots of supper glue to keep it pressed against the contacts. you can try a folded peice of paper to test.

otherwise you likely need to do a "clear storage" (hard-reset via software) then flash the stock rom after connecting with activesync.