I have a 2020 Superb hatch which has an odd intermittent issue which has started recently. 
 

At times, when the lights come on, the upper element on both the wing and boot will stop working. All other parts of the light work (indicator, break light and the lower element of the rear light) but just the upper element fails to illuminate. If you give it a gentle thump, it will come on but will then fail again soon after. 
 

I’ve tried removing the light and checking the connections but couldn’t see any obvious issues. 
 

Has anyone else experienced similar or have any ideas as to what has happened?

I've got the same albeit much rarer. 2021 facelift with the rear DRL's turned on through VCDS. Occasionally throws an error and EML on the dashboard checking rear light. Left side is off but flicks back on with a very gentle knock with the base of my palm. Doesn't seem to reoccur when driving on that trip or for a multitude of times later. Doesn't make enough of a problem to me until it presents itself that it may be more consistent. Haven't tried the indicator when it happens so not sure what wouldn't be working. Guessing its £70m for a replacement.