Default Wifi N-band Dropping

Has anybody else with an AT&T HTC One M8 had any issues with N-band wifi dropouts? My M8 seems to have issues every single day with staying permanently connected to N-band wifi. It requires me to turn the wifi on the phone off and on, at which point it reconnects fine...for maybe an hour or two. I've tried updating my router's firmware to no avail, and if anything it made the issue worse. It doesn't seem to have issues staying connected to the G-band. I'm on the stock AT&T 1.58 ROM, with the JMZ unsecure stock kernel.