Can I use the PWC in the Expansion box?

If not is it possible to figure out what the connection strength is on the PWC connected in the P4? I manage to control my Mitras from my sump room (so it got connection), but sometimes it wont control them (but are connected if I manually override) - what happens is I cant save a new composer to the lamps, and have to reboot them. (usually just 2 of 3 lamps get the new program, while the third is locked on its old one, but if I test on it with the slider, all 3 is responding).