To troubleshoot your laptop’s cursor behaving erratically when using the touchpad, here is a list of things to try:

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1. Adjust the sensitivity or speed settings of the touchpad.
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2. Check the power settings of the laptop to make sure it’s not going into sleep mode.
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3. Disable or uninstall any third-party software installed in the laptop, such as mouse drivers.
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4. Clear the touchpad of any dust or debris that may be interfering with its sensitivity.
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5. Update the computer’s driver software.
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6. Test the laptop using an external mouse.