L322 stereo buttons not working

Evening all, I have a 2003 autobiography and as of yesterday the buttons on the stereo decided to stop working, I still have sound and can use the steering wheel to change stations and volume, but cannot change to sat nav, cd or any other function. Is this the beginning of the end for the head unit ?

there is a reset (pull 2 fuses) they are marked on the fuse box cover

Thanks for your quick response marksman I did remove them one at a time to check them earlier but no joy, I’ve also been through all the plugs in the boot to check for corrosion or water ingress and they are all clean and tidy

Hmm, I would try disconnecting the battery for 30 minutes the, I have this intermittently (3-4 times a year) and resetting it seems to work each time, its important to pull both fuses and leave out for 5 minutes