Iphone 4s over heats, then wifi options greyed out

Hi
this is my 2nd Iphone 4s in less that a year (luckily it was under guarantee). It keeps over heating and gets very hot at the back and top. After a while the wifi option fades and I can't connect to wifi. Have people had this happening twice? I have only had this 2nd phone for less than a month and it's just happened again! so I'm very worried as my guarantee runs out end of January.
My husband says is because I forget to close the apps properly and my son watches lots of videos on my phone. I think the phone should be able to take as much use as you want. Sounds like a fault in the phone to me. Something goes loose when it overheats and the wifi stops working somehow?
Any help would be greatly appreciated!
Aliperi

took it to apple and they gave me another new phone. Just don't know how to avoid this happening again as I don;t know what causes it. Anyone has any ideas?

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