Sony Xperia E Dual hanging problem while surfing net?

last month as per the offer from flipkart i buy a new branded handset for me which is from sony and model no. was sony xperia e. the overall phone experience was quite nice it looks like a premium handset when you just hold this phone in your hand. The phone was working quite well but after downloading some of the applications to play game and make the basic use of smartphone it start giving me a hanging problem now.

what should i do. Please help?

I think it support 512 MB RAM and you have downloaded many applications so do not need to worry do one thing just format your handset and downloaded only the needy applications which you wish to have.