Hello,
same issue here on 
        Manufacturer: ASUSTeK COMPUTER INC.
        Product Name: UX331UN

with kernel: 
Linux shadow 5.0.0-16-generic #17~18.04.1-Ubuntu SMP Mon May 20 14:00:27 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

Occasionally, the touchpad freezes. Following message is printed in dmesg:
Jun 12 17:35:32 shadow kernel: [  522.384692] i2c_hid i2c-ELAN1200:00: 
i2c_hid_get_input: IRQ triggered but there's no data

The touchpad then needs to be disabled/reenabled using feature key on
keyboard.

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https://bugs.launchpad.net/bugs/1778087

Title:
  ELAN1200 touchpad jumps around and disconnects

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