Thanks Meter 716
Join Date: Mar 2007
Location: San Francisco Bay Area
Don't forget that 5GHz has a much shorter range than 2.4GHz; since the -AC standard has higher thruput it will also need more signal and what's probably happening is the OP has just enough signal to connect, but not stay connected, especially during periods of high thruput.
Samsung Galaxy Note 10.1 3G (GT-N8000) on AT&T
Samsung Galaxy Note 10.1 2014 LTE (SM-P607T) on AT&T (and T-Mo/VZW)
HTC First on Net10/AT&T
(Save your "Thanks"; couldn't care less)