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Actually the screen won't respond to tap & no sound would come out as well
I use to do all the stuff mentioned.
Luckily I accidentally dropped my PDA and damaged the screen.
So I went and bought a PDA with a dead board in ebay.
I switch the screen and those issue were still happening.
I tried switching the backup battery & the problem is now gone (most of the time).
So the backup battery might be dead;
(I am not sure that this is the reason of these occurances, but this did solve the problem for my X3)
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