In my experience
Hit the button once, it starts flashing until it's disco.
Then it stays solid until you get near 18mph which it will start flashing as it will auto reconnect above that speed if prolonged
It will also flash when you try to reconnect and the go off when it's done.
Rolling forward, swaying a bit can help and maybe have wheels straight too
If it's just constantly flashing - that sounds like some issue and you should be careful driving if it's stuck disconnected.
If the dealer has no clue, tell them to call for more support or just swap it