Problem with ARROW display or exhaust valve

[Koudelka007]

Hi, in my BMW M3 F80 I have an acrapovic exhaust and an ARROW display.
Sometimes it happens to me that when driving one flap opens and closes spontaneously, according to the sound I think that only one flap closes, it is recognizable by the sound.

This problem does not happen all the time, but occasionally.

The BMW diagnostics told me that the car did not report any error.

So now I don't know if there is a problem in the exhaust flap or if there is a bad software in the ARROW display.

Thank you!

PS: sorry for my english