I'm having the same exact problem with my Nighthawk C7000V2. Constant T-3 timeouts, and the techs have been out here more times than I can count to replace every single piece of equipment on my property multiple times. This is my 3rd brand new modem this year, and the same thing happened with both of my Motorola mg7540's before I switched to this one. So what's the problem here?
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