Bad Picture and no sound

#1
I recently subscribed to new service with Comcast and haven't been able to get things set up right from the day the tech first came out. I have 4 set top boxes and all of them are having the same problem with occasional flickering and intermittent audio problems. It doesn't happen all of the time, but probably 4-5 times a day when we watch TV.

Any help?
 

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