The model numbers you have oprovided are not showing as a good model number.
Please click here to go to the Miele web site and see if you can determine which of the listed models you have.
It may be that the unit is no longer supported by the manufacturer. If that is the case you will need to contact the manufacturer for possible sources for parts, and diagnostic information.
Most likely the touch pad has been contaminated with cooking fluids (cooking grease will get into virtually anything). Replacement will be required to fix the problem.