[1.1.2 OTB][SOLVED] Jailbroken, but freezing

Hi guys,
i've got this problem about two weeks after I jailbreaked my phone, suddenly when I started to use wifi and safari It just froze and all I could only hard reset and after reboot it would sometimes work and sometimes just freez again.
any ideas what could cause it?

My friend solved this by:
Setting Auto-Brightness Off
Auto-Lock Never

Try it...

i would have never guessed this would work, but it did, so thx.