Software Version 18.23 DFU-4d1582

Without any help, my watch went into the "green triangle mode" 2 days ago. After about 2 minutes just showing the green triangle, it changed to blue triangle and the watch started into normal mode. since my battery is draining (100% down to 28% with 3 30 minutes runs) intensely. Also, settings shows "Software Version 18.23 DFU-4d1582" since. Knowing DFU from my mobile it makes me wonder what happened.

anyone else with this issue/problem? 

highly appreciate any support. thank you!