apps not responding on hipstreet i8 tablet

i have a hipstreet i8 tablet. the last week it keeps telling me the google play store isnt responding and facebook keeps shutting down and wont respond or let me report the problem. i was on the phone (text) with the google people yesterday and we went though thier diagnostic stuff (codes) to try and fix it. nothing worked it is still doing it. they suggested i contact you guys. i have done a factory reset twice and also a uninstall and reinstall for both apps ( google play store and facebook) but nothing seems to work . do you guys have any ideas that i can do or try. if i need to repalce my tablet i will not be purchasing a hipstreet product. can you please help???