Craziness with audio. Problem apparently can’t be diagnosed.

About a week ago sound went crazy on numerous channels. One has noise like a jackhammer. Several last a secon or two and then go silent. Many have switched on their own from English to Spanish and can't be returned to English. Many channels in the 210-217 range and all HBO channels. Maybe some others. Last joke of a person I talked with said I clearly had fiddled with my TV and that clearly the month-old X1 box couldn't be at fault. Tomorrow I'll go trade in the junk box and get a replacement. BTW, the secondary small box that mates with the primary has no such problem.