Recordings Break Up
 

I'm sorry if this has been covered somewhere but couldn't find anything by searching.

I have had a V+ box from Blueyonder since they were released and often the picture on recordings will breakup and sound will give a loud shriek.

I did have the box replaced after a couple of months, but still the same problem.

Has anyone else had the same problem or have a solution?

I am using a standard CRT TV.