Heart Rate Monitor green light stays solid

My Garmin heart rate monitor changed from a flashing (or blinking) green light to a solid green light.

I've owned this for 3 years now and never had this problem.

The green light stays on and is a solid light that burnt my wrist in about 2 minutes. 

I turned off the monitor on my web dashboard, turned the watch off, turned it back on, and nothing has changed. 

Any ideas?