Hello,

This is usually the result of bad contacts on the flash-Memory-Board.
When you open up the MS40, you will see a little Flash-Board attached on the Motherboard. Simply remove the Flash-Board, and attach it again some times to clean the contacts.
Be aware : NEVER use contact-sprays to clean, as this attract durt after somewhile, making the problem worse.

Hope this helps to solve the problem.

Regards,

Carlo