This is a common problem I’ve discovered. You can “reset” this fault by physically removing the battery tube from the head (not just loosening 90 degrees) for a second or so, and tightening again. The light will turn solid blue again. However, after fondling with output the battery indicator will start blinking again as if battery voltage is below something like 3.7V (~50% capacity).
You can see this problem in this video here as well:
[video:]https://www.youtube.com/watch?v=56MWRHYo_2g[/video]
- batteries inserted at 6 min. 45 sec.
- switch on at 7 min. 16 sec. ==> solid blue light
- mode switching at 7 min.43 sec., and at the 8 minute mark he finishes cycling modes and the button isn’t solid blue anymore.
Exact same issue with the SC26 (original version) in this video:
[video:]https://www.youtube.com/watch?v=dbZHhvKlkW0[/video]
I’ve done two driver swaps for the MT07S, and the problem is still present unfortunately.