electrical power lost momentarily

Dropped my kids at school and went i got back in the car, it was simply dead, no power of any kind. got of the car and triyed to open the tail gate... nothing. While i was thinking how to get to my job, i heard a sort of click and electrical power was restored ! clock at zero and radio presets lost.
Before I stoped head lights where on, air cond too, and i closed tail gate electrically.
I seach the owner's manual for some kind of battery protection relay or so, but didn't find anything.
Does anyone knows something about this?
greetings and thkxs

OK... it happened again and when I open the hud... simple... neg. wire was a little loose, just enough to disconnect the batt power.
Naif of mine not to check it in first place, but it never crossed my mind it could happen on a new car !
It's not technologie just poor mounting.
Anyway thanks for the attention.






Dropped my kids at school and went i got back in the car, it was simply dead, no power of any kind. got of the car and triyed to open the tail gate... nothing. While i was thinking how to get to my job, i heard a sort of click and electrical power was restored ! clock at zero and radio presets lost.
Before I stoped head lights where on, air cond too, and i closed tail gate electrically.
I seach the owner's manual for some kind of battery protection relay or so, but didn't find anything.
Does anyone knows something about this?
greetings and thkxs