I am from Kosovo (Europe) and I have a Nexus 5 that I ordered through Play Store. The phone is great but I have a problem with GSM Signal. In 4.4.2 I was losing signal so the only way to get back to signal was to reboot the phone. The same happened in 4.4.3 and barely in 4.4.4 but with the latest update there are many times when people try to call me but i am unreachable and the same happens when i try to call someone, I cannot reach them.
Is there anything that can be done to fix this issue (don't tell me to contact the carrier because I will not get any help) or should I just wait for a new update from Google?