The apparent interference in Texas is almost always fighter pilots doing training. During aggressive maneuvering the aircraft fuselage can mask the GPS antenna, causing the aircraft to lose GPS accuracy.
Fighter jets emit ADS-B? I know it's only training, but I'm curious?
Go to https://globe.adsbexchange.com and once it loads, press "u" to show only military aircraft. You'll see bunches of helicopters, transports and tankers, trainers like T-6 Texans and T-38 Talons, and once in a while an actual fighter or ground attack aircraft.