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Cause of issue:
a. The CPU is occupied or processes too much, and cause the operating system to freeze.
b. After re-install the operating system of the Point of Sale machine, the touch screen driver program does not match the current system.
Elimination method:
a. Turn off the point of sale terminal and power off, then turn it on again.
b. Contact Sunany after-sale team, and upgrade the right touch screen driver program to match.