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This has been happening occasionally over the last two software versions.
Cannot reproduce as it seems to just happen randomly.
As I'm in reverse,
1) camera blacks out
2) all the system indicators go out except for park and brake
3) battery indicator turns to ----
4) everything comes back on in a matter of a second or two, and usually with the ding, ding, ding sound like it does when you first start it up and all the icons along the top light up for a moment.