Open an x terminal, and run this command

dmesg

try opening and closing the keyboard a few times then run it again

You'll see lines like:
[115496.124389] slide (GPIO 71) is now open
[115497.069641] slide (GPIO 71) is now closed

These lines report when the keyboard sensor is triggered..

If you have the rootsh package installed, you can try this to see the sensor activity in real time as it happens:

sudo gainroot
cat /proc/kmsg

this might help you track down if the sensor is being triggered too often