Help! Winning Ad performance died

I have a winning ad thats been running for a year. Has consistent roas of 3 to 4 over a 30 day period and consistent 1 to 4 sales everyday. All of a sudden yesterday and today 0 sales. Still getting good ctr and atcs.

It doesn't make sense. Frequency is 1.2, so its fine.

Have you had this happen and if so what did you do to fix it?