IPhone 4 Signal/Battery Problem!!!!!

I dont know how to explain this but my signal(carrier) drops to NO SERVICE every
1-2 hours i think (im not sure).
And my battery drops 30% oovernight (NO wi-fi, Push notifications, indeed it was on airplane mode before i sleep)
But i have a feeling that this is because of the apple's updates? Because it all starts when i update mine to 4.0.2-4.1.0
Anyone having same problem. Anyone know how to fix this?

As far as I know I don't have any issues with the signals.
Yesterday I unplugged my iphone at 7 AM sharp, at 10 PM, I had 83% remaining so I decided not to charge my phone, so I put it on airplane mode close all my apps on the multi-tasking bar and I woke up this morning and it was still at 83%. So my battery did not drain overnight. Right now it's 4 PM where I live, and my usage stats reads 2 hours 58 min. and a standby time of 1 day 9 hours and my battery % is at 53. So from the time I woke up till now I only lost 30%. Normally I check my phone every hour.
Not to mention on Saturday night I had 21% remaining before charging. So here is what I did before I charged mine. I connected my iphone to itunes and synced my iphone, after it was complete, I did a hard reset by holding the home button and the sleep/wake (ignoring the red slider), I let go of both at the moment it shuts off, so that it won't turn on by itself. I then waited a couple of minute, then I let it charge overnight, so this is what I'm getting.
I'm using the 4.1.
I would suggest doing the same, connect to itunes, sync, hard reset and recharge, this surely helped improve my battery life. If this doesn't fix for you, then try full restore and see if that does any help.

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