Mines had this a number of times,
Used to be just a case of turning the car off and restarting.
Tho that didn't always work
Then I fitted some sporting clocks and the flashing was constant,
My brother then hooked it up to his fancy diagnostics tablet and done a proxy alignment or something, think thats what it was called. Don't quote me on that lol,
Anyhow, haven't had a single blink yet....