Quoted from chaskett:Disabled = bent leaf switches so they won't set off the tilt.
Make sure you don't have a leaf switch touching ground (or even near ground, that could touch with vibration). That will wreak havoc with the switch matrix.
Quoted from CrazyLevi:Carefully check below the battery holder for any hint of green. You could well have some battery corrosion that has messed up your switch matrix.
+1 on this.