Frequent connectivity dropouts on GigaPower

For the past month or more I've suffered intermittent connection drop outs on GigaPower. If I wait 20 - 30 seconds I suddenly have connectivity again. When this happens even web pages on the ATT device show a 408 error.

I'm at my wits end. Tech support gave me a bogus answer that the wireless on the ATT router was probably interfering with the other wireless routers. I was careful to put eveything on a different channel and before GigaPower never had issues with radio interference with the exact same setup. Obviously disabling wireless on the ATT router did not work.

I need my internet connection for my work as a software engineer and don't know how to get the right kind of attention on this problem. This webpage describes the exact problem I'm having http://stopthecap.com/2014/04/23/att-gigapower-cant-even-reliably-deliver-300mbps-service-complain-customers/