HD Signal QOS and HT lose of audio and sub BUMPS!

This has been going for years. One channel, every night, between 7 and 8PM, HT HD RX Led indicates loss of HD for less than 1 sec, looking closely at screen can sometimes see pixialation/signal drop. Causes loud BUMP (subwoofer) and 1 sec lose of audio in HT. During commercials, OK. Only occurs during syndiated national shows during this time on this channel. India call center is of no help what so ever. 

PLEASE FIX!!!!!!!!