iPad 3G losing signal

Hi there

I have an iPad 4 32GB wifi and 3G. The problem is that it keeps losing the 3G signal, it says "no service" so then I have to restart it, which becomes a pain every time I want to use it. When it has finished restarting, the signal strength is very strong, although I haven't even moved.. This is since I've upgraded to iOS 7.

I've also got an iPad 2. I have them side by side, loading the same webpage and the iPad 2 manages to load the page way faster!! Yes, they are using the same internet, same speed etc. I've noticed my iPad also freezes halfway when loading the page.

This is becoming a real pain every time I want to use it..

Anyone have the same problem or does anyone have any advice??

Thanks