[jeiyuu]

I have the same issue, but I believe I created it myself. I was reading through the posts about various missed calls, so I did as many instructed about today time-out ect. I believe that the screen waking up every 30 seconds is due to the unchecking of the boxes under the settings->system->power->advanced which was supposed to solve the missed calls while sleeping. If you recheck the "On battery power" selection, I believe this will remedy the problem.

Hope this helps.