Default Random problem - Screen not turning off

Hi,

Since upgrading to Tizen a couple of weeks ago, I've had a couple of occassions where the screen has stayed on and not dimmed or turned off.
I only notice it because I get the low battery warning and think it shouldn't be dead so quickly. I then watch it for a bit and notice that it doens't dim or turn off. Changing the screen timeout from 10s to something else and then back doesn't make any difference.
A reboot lets the screen timeout work as normal again.

I probably looked at the watch a few times whilst it was stuck on and just thought that it had been triggered by the movement sensor.

Anyone else have this problem?

Didn't have this problem under Android (had the watch since November last year)