My phone won't stop freezing!?

[C]

I have an android phone (samsung galaxy ace) and it literally will not stop freezing. I have tried restarting it, deleting cache and cookies etc. And I even factory reset it which didn't help at all. I have two apps on my phone and then a cache cleaning app and I have like 5 pictures also I have deleted all of my messages. Nothing has helped at all and I am getting really frustrated. It mostly freezes when I open up twitter or tumblr, it starts going really slow and then just freezes. But it freezes anyway after a few minutes of using it (literally like 2 minutes.) I have tried deleting the apps and then reinstalling them but that did nothing. Everytime I restart the phone it freezes again straight away. I can't get a new phone since I'm not allowed. This is really annoying me and I don't know what else to do, I would really appreciate help. Thank you