Ive had a few blinkies Schwinn etc did same thing. Just whack em.

I used to work with a Raytheon ATC radar that would blank out just when
things start getting busy. Maintenance guys worked on it for months with
no luck. In the mean time we just whacked it in right place with a stick and
all the airplanes re appeared

You will hear endless technical reasons for the cause.

Even the best electronics just needs a good beat down......