Having just upgrade the firmware to V32 for the Mk4 Nav everything went fine with no apparent problems. After about 2 days the system re booting and occasionally locks up. This appears to be intermittent and some days worse than others. I tried to reinstall the firmware but all that happens is the system message that the latest version is installed.

So any how I am not sure if this is actually due to the firmware upgrade and something going wrong or down to another issue with the system or car?

Is it also possible to downgrade the firmware back to V29 and re upgrade?

Any help would be most appreciated.