hei,
i also got an prs-t1 and mine started showing problems lately ( i think i made an firmware upgrade earlier)
so i followed this routine here
https://www.mobileread.com/forums/sh...4&postcount=18
and it was a bit tricky but not too much.
luckily i had a computer with linux and windows on it so i used mostly linux and it worked beautifully now i am on version 1.05+ and the problems i had with the prs-t1 are gone!
i am pretty sure the firmware caused the malfunctioning, but i could be wrong on this.