Massive battery drain out of no where (Tactix Delta)

Battery went down from 25% to 5% in less than 2-3 hours, after i charged back to100%, the battery is now down to 95% in less than 2 hours.

I restarted the watch, and looking to see what might have caused it. I started the "indoor row" app earlier today, wonder if it is a bug in the app. This was never a problem before, been using it for 4 months now.

Has anyone else noticed this and any tips?