XPS Touchpad stopped clicking

I have an XPS 9520.  Yesterday, out of nowhere, the bottom right and left sections of the touchpad stopped literally clicking.  The touchpad still works, and if I tap the relevant sections the functionality works.  The corners of the touchpad don't depress much, and they certainly don't have the "click" sound or sensation.  It is driving me batty.

I tried turning on and off the touchpad in the device manager.  I tried updating both the HID-compliant touchpad driver (in the human interface section) and the HID-compliant mouse driver.  Neither solution worked.

Any suggestions would be appreciated.