Hi vauxhall technical say they have to carry out a full d.i.d test anyone know what that means ?

Hi thx for your reply, happened again ,vauxhall had it for 3 weeks but the fault never happened, now have a new fault lane change fault, vauxhall talking to tech team as I videoed the fault message, but it's been nearly 2 weeks with no solution it is a pcp car have the right to ask for another vehic...

3 times now my grandland wouldn't start first thing in the morning dash saying collision management fault, waited 10 mins then starts, been in garage but they cannot find any fault, a friend says it could be morning dew on the collision sensor, is this right? Any help much appreciated