Might be worth doing some searches for faulty gear selector, I don't know whether that is relevant your issue or not, but it does seem to be a common fault. It often starts out intermittent, then progresses to being more frequent. Most reports have mentioned an error msg regarding selecting park.
Was the tapping sound like hot metal contracting as it cooled down ? I haven't heard it on my W'burg wagon, but have heard it on other cars, particularly if the engine or brakes have been worked hard just before switching off.
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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