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AM335x touch screen not stable

Hi guys,

I am using AM335x-EVM with SDK01.00.00.03, and the touch screen has some problems.

When the machine was boot up, it will run ts_calibrate first.

Then we can run the "ts_test" to test the calibration results, I found out a strange situation.

If I gently to draw the screen, it will show some shift point.

But~, if I hardly to draw the screen, it wok normally.

Here is the test video. The first half of video is the result by drawing gently,  and the last half is the result by drawing hardly.

Is anyone have this situation like me? Or any suggestion to solve  : )

Thanks,

Steve