My AT&T iPhone 7 is frequently dropping signal. It'll usually retain the number of bars I have, but will lose the carrier name and LTE tag for a few seconds before coming back on. Occasionally it will go all the way down to 'No Service' before springing back up. This whole thing happens so fast that its sometimes unnoticeable during use. But, I'll usually have to reload the content when this happens. I've read about signal issues with the Verizon iPhone but is anyone having this problem on AT&T? I've tried resetting network settings and using LTE on "data only" but the issue remains.