To correct a SCUF Infinity4PS PRO touchpad that is stiff or auto-engaging, perform the following troubleshooting steps.
Step 1: Take both of your thumbs and push down on the bottom of the touchpad.
Step 2: While still pushing down, gently slide your thumbs toward the top of the touchpad. You might head a clicking noise as the touchpad lock into place.
Step 3: Repeat this process two or three times to make sure the touchpad is fully secured.
Step 4: Press the touchpad up and down multiple times to make sure activation is smooth.