Auto-pilot disengaging when not wanted.

I have a problem that only occurs with PMDG Aircraft. When I push the J1 BTN 3 on my Saitek X52 Joystick, to change my EZDOC Camera view that shows the auto-pilot in the cockpit, it disengages the auto-pilot. I have to manually push the auto-pilot  button in the cockpit to engage it again. When I push any other button or toggle to change to another camera view it's fine, the auto-pilot stays engaged. I've checked both the FSX Keyboard settings and my FSUIPC  Settings and there isn't a conflict. I will also post this problem in the PMDG Forum, but there are a lot of bright people here also. Any ideas ?