hello people, i'm kinda new over here. So i would like to have some answer to my problem which is related to my phone.

I've been noticing my Nokia N900 has a unsual increased in heat during the afternoon. I thought it was temporarily as i ignored it.

Around evening i played games as Angry birds for 30 mins and the phone was function at it's peak with no problems.

Around night the phone got overheat again, when i tried to tap the screen i noticed it was off. Possibly i tried to switch it on and it failed. I waited few minutes for it to cool down but it seems to remained the same and i cant switch it on at all. I took out the cover and the battery and kept them discharged for 30 minutes. And I placed the battery and power it on. It works as usual now.

Anyone has opinion regarding this matter? I would like to avoid this from happening again.

Im just having a slight probability if it has to do with speakers system which i bough yesterday. the details of the speaker are Sonic Gear Evo8 Pro.
thanks again. Your reply are much appreciated.