lagging and hang v0.91 on w950i - never happen on v0.90

i installed v0.90 and upgrade to v0.91,
all movie files are same,but when i upgrade to v0.91 i chek a few movie had some problem to watch,lagging..and make my device (Sony erricson w950i ) hang and need to restart to work again,i tried a couple time still have same problem.this problem never happen on v0.90

i'm using OS UIQ3

ps:info from me as w950i user,maybe can get solution.

Ps: sorry about my english