Hmm... it sounds to me like your tablet is having a hard time keeping up with all that is running. The ram may not be enough for all the apps running. Many can be running, even if you aren't actually using them.
I would suggest that before you play you make sure nothing else is running in the background. This should free up a lot of resources and you should then not have this problem, or not as often, as even if that is all that is running, after a while the game will use up the resources.