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Did this start after any Windows update or software changes like game/ application installation?

Run a hardware diagnostic by following this link bit.ly/2fJuGXB   & check if there is any error listed.

Run a custom test on the touchpad by following these steps

1) Press at the welcome screen for the boot menu

2) At the One Time Boot menu, press the arrow key to highlight Diagnostics, then press to begin ePSA.

3) Choose no for memory test and then choose system test

4) Now click on custom test and highlight Touchpad/ input devices and click run test

Manually disable touchpad & connect the USB mouse on different ports to check if the issue persists.

For my reference, click on my Dell username & send a private message with the service tag, registered name & email address.