My MaxiDiag worked fine for a few months. Now it still works for a few minutes (when not used for a few days), and than it freezes. I only can go backwards in the menu, and scrolling only goes forward on the screen. This can happen in any part of the menu, and is not car-related. The 'ok' button does not makes anything happen, only the 'beep' is still there. It is not a matter of wear, the device has only been used for about 15 times. All the suggested 'updates and install' are done on the SD-card, the device is registered and has free updates. Is there also any software on the Maxidiag itself that could be installed all over again, or is the SD-card the only way to fix software related problems?