It's the inersia switch, if it isn't mounted solid then it will activate, i've had this problem, it started happening to me when i installed my dual battery, i moved the switch so i could fit the tray and cable tied it to the ABS modular, it used to activate when i hit even a mild bump, check it's tight and not loose.
As soon as i remounted it to the firewall again as tight as i could get it, the problem stopped.
Also check it for dirt and corrosion it may be playing up because of that.
Baz.
Cheers Baz.
2011 Discovery 4 SE 2.7L
1990 Perentie FFR EX Aust Army
1967 Series IIa 109 (Farm Truck)
2007 BMW R1200GS
1979 BMW R80/7
1983 BMW R100TIC Ex ACT Police
1994 Yamaha XT225 Serow
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