First off you should always have the volume off on empty inputs. What is shutting off? Is you direct box a passive device or does it have isolation? Have you checked the current load to make sure you are not overloading your circuits? Put and amp meter on the feed and monitor the current and see if it spikes when this happens.


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.