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WakeLock acquire() method sometimes takes 30 seconds to turn on the screen  RSS feed

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Background My previous Android tablet's power switch became dodgy and took several presses and wiggles to work. Very annoying. I looked at a program: Shake that would wake up a tablet when the tablet was shaken.  But it wasn't 100% reliable.  So I wrote my own wakeup program to turn on the screen when the tablet was raised ~70 deg from horizontal.

The problem It usually works as desired, however some times it takes ~30 seconds to turn on.

My question is: Is there anything I can do to make it 100% reliable?

The debug output:

WU Sensor values=[-6.454, 1.034, 4.549], hitCount=1, cnt=84421 at T 17:01:17
WU Sensor values=[-9.96, 1.063, 2.499], haveShown=false, hitCount=1, cnt=84424 at T 17:01:18
Sensor values=[-9.96, 1.063, 2.499], since last=9255866, cnt=84425, hitCount=2 at T 17:01:18
ScrnOnOffSrvc turnOnScreen acquire at T 17:01:18  <<<< Before call to acqquire
ScrnOnOffSrvc Turned on screen at T 17:01:48 ScreenOn=true  <<<<<<<<<<<<<<< 30 seconds later<<<<<<<<<

The source for the above:

The full code is here:
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