my apps close with no reason

hi everyone, i have a problem with my android apps, i had my toshiba thrive with honeycomb and sometimes my native browser closes and i go back to the home with no reason, i try to use another browser, firefox, opera, dolphin, maxthon, and skyfire, all with the same result opera and skyfire dont close so fast, but well i say i can live with that i download another apps games music etc and with the same result for example i was playing sngry birds and some time the game only close and go back to home, i think theyre not crashin because dont say any message that say angry birds has close unexpectly etc etc like facebook or google+, i try to use task managers to kill process but the same, after that i come the ics upgrade i was happy because i think it gonna be over that issue , i install ics and the first day it work but now i have the same problem do anybody know whats goins on with android or the thrive tablet???