Im on both sides, my original red had massive battery drain and wouldnt stop, wouldnt last me the day. So i exchange, nokia sent me a white lumia 920 as a loaner until a red one was available again.
Of the month i used the white, the phoen was great, battery lasted all day and had no other issues except black screen when calling which was resolved by blowing into sensor. Other than that, the phone was a beast and can easily last me more than a day with no issues.
Now, nokia sent me a red one to replace my original red and this phone is defective with rebooting and battery drain.
Im on the "problem free" even though of the black screen during call because all phones has a hiccup every so often, i've owned 3 iterations of iphones and each had problems at one time or another, there is not perfect phone. So the black screen is one of those quirks, but was resolved.
But im back on the problem bandwagon with this replacement red grrrr. I wish i could keep the white, but i had to give it to my niece who's phone died and using it as a loaner now