The biggest one for me is the touch screen bug, but also, I get intermittent network not available messages ( I am on Telstra who happen to be the leading Telco in Australia so I'm sure its the device - happened on my Lumia 920 also
I've really had no issues except for quicker than expected battery drainage. I'm not sure why. People have claimed going a day and a half in between charging. I can't do that currently. I get 5 -6 Mbps down on ATT. Still curious about the RM-938 if that ever comes out. I'm really thinking about selling my RM-937 and waiting for the RM-938 just for the LTE. Though I don't think I need it.