Have you tried checking if you are running the most current firmware for your MMP? Maybe you can try the Caste Creations thread to see if there's a version of firmware that is most stable.
When I had a MMP id occasionally have to roll back to the previous firmware version and then re-install the current one to get it to run glitch free.

If you have extra cash id shell out for the Tekin. I cant recommend enough how well the RX8 works well with the Pro4.