Had the same on an Octavia, got RAC out and they replaced it with a better one. Had loads of issues with infotainment system.
I had same issue with a golf and was only a few months after getting it. Every warning light came on saying this and that system was not available. Nothing about having a low battery at all.
My partner then popped into the supermarket, I stayed in the car, Had a call to make. Had nothing on whatsoever. When she returned car wouldn’t start. Called Rac and they tested the battery and it was faulty.
He put in a bigger one in and never had an issue with it for the rest of the lease. I do believe they putting in small 12v battery’s as a group and this causes issues for many, never mind them just being faulty as did a 3 to 4 hour, 150 mile trip every week back then. Still didn’t have any issues when I stopped doing those long trips and only did local ones for months.
So I’d say call out the rac they’ll put a better battery in it than the dealership will.
EX30 SMER Ultra