Losing signal repeatedly

Ok...so for the past 2 days my uverse will lose signal. Sometimes it'll lose it, then channel will come back eventually--this has taken anywhere from 5 mins to over an hour. I've checked all cables, restarted it numerous times & it still does it. This is happening with all tvs. Any suggestions? I've not done the hard reset yet...I've unplugged it, waited, plugged back in...ive also hit reset on all equipment & it still does it! Any help is appreciated!