My quick reaction is not to panic. It's probably
likely to stay that way for a while, with a possible failure of turn signals in the distance future.
My first guess is the light module which is probably not casually cheap to replace. Have to search Bentley further for better ID of the component that flashes the signals.
Perhaps someone else has had exactly this and knows what the cure is.
Thank heaven for all my LED rear tail
lights. Only problem will be if they ever fail, it'll cost me a bundle.
Had almost the identical problem and
what I did was change the rear directional signals. That cured it. BUTwhen it happened again, I found out it was the front directionsl signal. What you should do is when it starts blinking quickly, stop and look at you bulbs, one of them is out. I hope that is the easy fix, otherwise it may get into more costly things. I also found out on my car that the silver tip on my bulbs sometimes seems to melt down, not sure why---but the answer may be to use BMW bulbs,