Problems using an Ansmann P_100 Pentax K100D Super Grip

I am having major problems with my Ansmann P-100 battery grip purchased to use on my Pentax K100D Super Camera.

When I initially install the grip onto the camera all appears well for approximately 10 to 20 shots, then what ever button or change or wheel I touch the shutter just keeps going off rendering the camera unusable.

If I then reinstall the original four off AA batteries the camera functions OK.

The supplier has exchanged the unit for me but the problem persists even on the exchange unit.

What I would like to happen is to try the grip on another members K100D Super to test if the fault is with the grip or the camera.
I live in Chilwell Nottingham NG9 4DQ and would appreciate some help.
Contact details Mob 07580678541

Regards

Teppy