Got a weird issue today with Forerunner 265. Tried starting a Indoor Bike/ Free ride today, and it started beeping right away, showing finished loops, one loop per second or two. Tried stopping and restarting a few times. Tried setting up a target (time and distance), same thing happened, and in about 5-6 seconds the watch told me that the target (33 km) is reached.
What should I do if this happens again?