I've had mine bang a couple of times. I think maybe twice? Then it was downshifting slow in D2 when I would come to a corner, slow down and the DCT would stay in 4th.
Only issues I've had so far with the DCT. I also had a rough idle and eventually constantly would go into limp mode. About 2 weeks ago, I had a vacuum sensor near the brake booster replaced which seems to have cured everything. Hadn't had a slow downshift or a bang yet.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red