front turn signal intermittent failure, where to start checking?

[ben senise]

i have a 2020 ST that is only a few months old. from time to time, the left turn signal will flash quickly. a return to off and on again has always returned it to normal. yesterday it occurred at a place where i could stop  and get out of the car to see which light it was. turns out to be the front left turn signal.

in the "old days" this would indicate a burnt out bulb but since all signal bulbs are LED in this car (front amber on headlight assembly, mirror, and rear) and the problem always corrects itself by turning the signal off and back on again, i'm wondering what the failure could be so i know where to start looking.

would a loose connection cause these symptoms? i'm thinking not since it always corrects itself by turning the sign off and on again. i'm thinking that a loose connection would remain in failure mode.

could it be the headlight assembly? electronics somewhere?

obviously the car is under warranty so i can just tell them about it when i go in for the first service. i'll have to record the signals when they fail because you know what happens; they won't be able to duplicate the problem.

if anyone has any ideas, i'd like to hear them. thanks.