This has happen a couple times to us too. It happens out of the blue and they have to send a tech out and do some magical repair that leaves me with some new piece of equipment to make it work. They don't charge me for it but it's always something. When the next tech comes out they remove what ever was put there last and put something completely new in somewhere else. The system works great for a while then "bang" different TV's in the house start popping up with the error and locking up the TV. We have to pull the power and plug it back in and let it reboot. Mine started doing again last week so once again I guess I need a new doo hicky.
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