Several reasons (some basic info) behind this according google: bulb, fuse, relay (though I don't see any indication of relay switch for turn signal on the 2012 Honda CRV)
It usually happens around winter time when it's cold. So I think it has to do with temperature. This time it starts with the right signal blinking fast from time to time, then it's always blinking fast (I think it began around October 2022). And now (Jan 2023) the left turn light also starts to blink fast every time.
So I'll start with bulb change before looking into the fuse. Going to order some bulbs and keep them in stock if not needed:
Amazon Order Front turn signal light Socket Type 1157NA, Amber: AUXLIGHT 2057 1157 2357 7528 2057A 1157A 2357A LED Bulbs Amber Yellow, Ultra Bright 57-SMD LED Replacement for Blinker Lights, Turn Signal/Parking or Running Lights, Brake/Tail Lights (Pack of 2)
Amazon Order Rear turn signal light Socket Type 7440NA, Amber: AUXLIGHT 2057 1157 2357 7528 2057A 1157A 2357A LED Bulbs Amber Yellow, Ultra Bright 57-SMD LED Replacement for Blinker Lights, Turn Signal/Parking or Running Lights, Brake/Tail Lights (Pack of 2)
Unlike the front, the back turn signal light replacement would require a screwdriver.