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Does anybody know why this happens?

Are you opn T-Mobile by any chance? It happens to me occasionally, although rarely that often. Also, it tends to come round after about 5 minutes anyway.
Just as an aside, I used to think like you and turn off the Mobile Network, but after experimenting I found that the difference in battery useage when it's on is very negligible. I would leave it on.
Just make sure your syncs are set to something sensible, and that "Always on mobile internet" (or whatever it is in settings) is disabled.
Hope that helps.![]()
I'm on Orange, and what do you mean by syncs, sorry new to this stuff lol.
I'm sorry for not being clear. By syncs I mean all the things you have set up to syncroise, like Facebook or twitter.
I would leave it on all the time. If you're not actually downloading anything it doesn't use that much power.