this is the problem I get too so I turn it off by using this

# Turn off touch pad
# placed in ~/.xproflie also 
exec xinput set-prop 12 "Device Enabled" 0
exec synclient touchpadoff=1 
exec synclient VertEdgeScroll=0 
exec synclient TapButton1=0
exec synclient TapButton2=0
exec synclient TapButton3=0

you can google synclient touch pad linux for key words to find out more

this is the problem I get too so I turn it off by using this

# Turn off touch pad
# placed in ~/.xproflie also 
exec xinput set-prop 12 "Device Enabled" 0
exec synclient touchpadoff=1 
exec synclient VertEdgeScroll=0 
exec synclient TapButton1=0
exec synclient TapButton2=0
exec synclient TapButton3=0

you can stick this is your bashrc file to trun it on and off

alias TT='touchpad-toggle'

###

function touchpad-toggle {

# toggle synaptic touchpad on/off

# get current state
SYNSTATE=$(synclient -l | grep TouchpadOff | awk '{ print $3 }')

# change to other state
if [ $SYNSTATE = 0 ]; then
    synclient touchpadoff=1
    echo "touchpad OFF"
elif [ $SYNSTATE = 1 ]; then
    synclient touchpadoff=0
    echo "touchpad ON"
else
    echo "Couldn't get touchpad status from synclient"
    exit 1
fi
 }

####

alias TT

you can google synclient touch pad linux for key words to find out more