[Spirit5676]

I had the same, but NBT with navi after update`ing the maps from 2013 to 2018-2 and because of the 3d content and my old firmware on NBT, that loop was happening.
It got fixed by flashed the NBT.
I was so desperate that I done it without a battery maintainer, but after a 45 minutes journey to work and the battery was perfectly charged.
I will not recommend, my luck was that I had a spare shirt with me (never sweated so much). I was so nervous to not fail and brick it
But if you have the right tools, a flash will fix it.
Good luck

I got a 55A power supply ICOM etc.  So flashing is not an issue. Just wanted to know if anyone got this issue.

Remove the SD-Card in the HU and see what happens. Sometimes a corrupt SD-Card causes the bootloops.
The SD-Card is located right at the front, behind the silver sticker / label.

Didn't know there was an SD-card in the HU_champ. I'll check that too, when I get the chance to look at the car. So I don't need to remove the unit from car? Removing the panel housing the start button and the ihka/radio front panel is enough? Anyone got a picture of the sd card location?