Problems recovering signal when iPhone 5 lost it. Bug?

Question

Hello,
I'm experiencing random problems with my iPhone 5 when I lost the gsm signal (i.e. When I go down to a parking). When I go up to the street the iPhone cant recover the signal and 'no service' message appears. The problem happen randomly, sometimes the signal appears again.
I think that this may be a bug because there are three different iphones 5 in my family and I have experienced the probem with all. The three iphones are in 6.0.2 and the cell operator is different in each one.
Anybody has experienced problems like this?

Answer 1

I originally bought my phone, well actually pre-ordered it, from ATT here in the US. I had issues with the connection loss from day 1 of getting it activated. I spent probably about 30 hours over the course of 6 months on the phone with ATT and Apple support. Apple always blamed ATT and ATT blamed Apple. I had a friend who worked for ATT and he went through all my stuff that ATT handles and got it all set up properly and I still had the issue. After that I concentrated on Apple.
I did, however, a couple weeks ago get my phone replaced after spending 2 hours on the phone with Apple arguing that I was still having the issue and Apple trying to push the blame to ATT and the support person even went as far as to put "DO NOT REPLACE PHONE" in my support notes, the rep in the Apple Store didn't notice me reading the notes over his shoulder. Long story short, phone replaced and still have the issue.
I've noticed if I'm on 4 bar LTE and I get a phone call it will drop to 1 bar 4G while it is ringing and stay that way for about 5 minutes after they leave a voicemail. I have officially decided to switch to the Galaxy S4 because I am tired of having a phone that doesn't work, which is very dangerous. Prime example. I live in Oklahoma, where a tornado hit 3 miles from my house. My wife called me to warn me. After that phone call I could not send a text, EVEN WHILE ON WIFI, or make a phone call. I spent 15 minutes resetting the phone and trying everything I could to get a call to her to tell her I was okay. I actually had to turn my xbox on and have a friend in another state call her for me to tell her I was okay and my phone wouldn't work. My brother, who lived 2 miles away had no issues with his ATT Galaxy S4 when I was having issues so it wasn't due to the storm. I recommend that if you have an Apple Iphone 5 that has issues, switch to the Galaxy S4 or another smart phone. I think there are more Iphone 5s with the connection issue then there are without connection issues.