Radio keeps playing after ignition key is removed.

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I've just noticed in our Golf5 that radio keeps working for about 1-2 minutes after key is removed from ignition and doors can't be locked until it switches off.

It's too dark to investigate now, will connect VCDS tomorrow and see if it gives any clues?

I just wander if someone else had this problem before?
Any hint appreciated?

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Update:
Just connected VCDS found 1 fault 01303 -Telephone Transceiver (R36)
004 - No Signal/Communication

Cleared the code and everything is back to normal.

Will see if the problem comes back.