Just to improve (?) the statistics: 1999 Octavia LX, yesterday I had the same problem. Fuse 15 removal solves it, with the usual side-effects.
For a year or so I had another problem, which might be related.
After disconnecting battery, the odometer (not the trip one, but the one that measures lifetime mileage) resetted to zero. I thought up to now, that the failure of some small button-battery,
like the one on computer motherboards, caused this. Since then, any time I disconnect the battery I get a 0 km car.
Now I found that removal of the fuse (probably fuse 15, but I have also removed some others like 11 and 7 to check if they are faulty)
beyond the clock and trip meter, zeroes the mileage odometer, too.
Thanx everybody on the list for sharing thoughts and suggestions.