The X1 box is my living room worked for about a year and then stopped functioning. The first technician didn't bother to troubleshoot it, just replaced the box. That box worked for a few months and then started working sporatically. When the second technician came, there were no errors at that time, so he assumed it was user error. He replaced the box so the job could be closed out. He actually had problems with the signal during setup, but assumed it was on the Comcast side. That box lasted less than two weeks and then stopped working completely. The third technician didn't even bother with the box. He removed the connector panel from the wall outlet and cleaned off some paint and residue. The box not only started working again, but it worked better than the last two.
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