available for n85?

hey guys n girls.
having some problems here.
1) whn i use video call, my screen will black out for 1 sec for every 30 sec i talk, but no effect on my fren (the 1 i called). this is so irritating to me. help me pls....i m 'kaki video call' hehe!
2) after i use the phone, i will keypad locked it and put in my pouch. when i take it out ,without pressing any keypad unlock, it will automatically unlock for 1 sec and then locked again. as if the phone is 'terkejut' of the light. y is it so? any help?

thx in advance first!