Backlight on Keyboard fails to illuminate

Numerous occasions now where the backlight on the keyboard does noy illuminate in datk conditions. 
Have to reset the device wich is annoying. 
Am running the latest software 10.3.0.908
Thanks,

My keyboard illuminates in dark pretty regularly & in bright sometimes on/sometimes off ...I have not yet figured out how this phone thinks ...they could easily have illuminated the spacebar too the lack of which is somewhat confusing in pitch dark ...oh, well ...it must be a waterloo thing...
10.3.1 SW .1779 OS .2726 WLAN .1.1 Radio .2727

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