I keep hearing a kind of creaking noise going over bumps, from behind me - like the rear door area. Strange thing is, it’s not there all the time. It seems to start after 10 minutes or so of driving. I applied Gummi Pfedge to the rubber seals but it didn’t work. Anyone experience this and know of a fix? Many thanks.

 

Try folding the rear seats, drive for a while and check if it makes noise again.
In my case I found out it was the seat latches. I sprayed some garage lube on the metal hook and fixed it.

 

Thanks, I’ll definitely give that a go.