Watching Bruins on NESN HD on 5434 & Celtics on CSNNE HD on 5435 when screens go blank! Did a 6-1-1 to check strength-normal. All my other HD ch. on 61.5 various tp's ok. Why is that tp30 is the only tp I have a problem with? ps-both post game shows over-normal screen back. I know others in Vermont who have same problem w/tp30. Paul