Clock/instrument cluster issue

Hi.

I have a 2005 A3 2.0 TDI and having some strange issues with the clock and date and computer 2.

1. When trying to set the clock it will allow me to set the hours but when I try to set the minutes it won't allow it and then just resets the whole time to a random number.

2. When the engine is switched off overnight the clock usually resets to 00:00 but sometimes rests to a random number.

3. even when the clock does show a random number it does not count up each minute just sticks on the random time until the car is left off overnight when it will reset itself again.

4. Computer 2 does not seem to be holding the average mpg and just matches computer 1 as if it again is resetting itself overnight.

Any similar experiences?

I've checked the fuses. Starts fine. Any suggestions?

Thanks