My iPhone4 loses signal and when I do hard reset, I can't send or receive SMS and calls. I have to back-up and restore weekly!

It started last month before I ungraded to iOS5. So my network provider advised me to upgrade. It fixed the problem but it happens again after several days. I lose signal then when I do hard reset, signal is back but I can't send or receive SMS or make and receive calls. But from the other end my phone is ringing but nothing is happening to my phone.This is really frustrating! Coz it happens weekly and the only way to fix it is to back-up and restore. Which is a hassle coz it takes me about 3 hours! Please help. My phone is still under warranty but the provider is telling me it might take them 3 months to check and fix.
I think there is a bug with the iOS5 coz it happen when it I upgraded. Before I was quite happy with my iPhone4 but now it has become a source of anxiety and stress. I've received a lot of complaints at work coz they couldn't contact me.

Try to set it up as new device without using the last backup: How to back up your data and set up as a new device

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