freezing/crashing/closing problems GS2

[SWErdnase]

Hey AC,

I bought my first android phone last sunday, a Galaxy S2.

I installed some apps and games. It ran pretty smoothly the first 2 or 3 days but now, I go on the internet, open up a few pages and the phone closes the browser app with no explanation whatsoever. Same with games, specially Inotia 3 and Falling Fred.

Is there anything I can do to fix this? it's annoying to be browsing and have it close up all of a sudden

Thanks!