Kobo Vox freezing 10 minutes into every use! what do I do?

I've had my VOX since Xmas 2011 so not quite a year, lately when after about 10 or 15 minutes of using it either on the web, game or library it freezes, sometimes a screen comes up saying activity freeze force close or wait. I push the button and turn it off, turn it back on and the same process happens all over again. What am I doing wrong. I've read a few of the other threads regarding the freezes and people referring to 10 second reboot, I'm taking that to mean turning it on and off. I really don't have much on it at all, a few games, like scramble and words etc and of course books all from Kobo so really confused about what is happening and what to do about it. I found these forum on a google search and would be very thank-ful of some help!
thanks in advance!
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