Bootloader started without user interaction

I received a new Fairphone 5 with e/OS last Thursday.
Saturday during a car drive with magic maps navigation running and USB plugged in, the screen suddenly changed to attached bootloader section.

What’s wrong, is that a forced update??

What happens if you select to boot the system with the volume buttons (current choice is given at the top, in your screenshot “Restart bootloader”, which is where you already are) and then enter this choice with the power button?

Already did that, now the system seems to run “normal”, I’m just curious/concerned what caused this behaviour " out of nowhere"… ;(

OS updates need user interaction to start.

Does any sudden shock apart from the ordinary come to mind perhaps, a huge bump in the road?

Nothing special happened according my memory.
Do you assume that maybe the battery lost contact for a moment?

It would be a possible cause, at least.

I remember loss of battery contact being seemingly pretty common when Fairphone 2s began to wear out back in the day. Affected users (including me) mostly just folded a small piece of paper or used a small piece of cardboard and inserted it into the battery tray to press the battery more against the contacts. I believe Fairphone support at the time even had a fitting piece of material prepared to send out to users contacting them about this issue, and third party Fairphone 2 battery vendors were seen including such a piece with their batteries from the start.

The Fairphone 3 battery then got additional support to the left and right to prevent loss of contact (I assume, I don’t know why else those prominent studs would be there), while the Fairphone 5 battery to me looks rather slick again in comparison.

Thanks, so far it was the only incident.

Who know maybe you ‘pocket dialed’. There is a button combination. But from a running phone not really plausible because it first needs to be shutdown to get into bootloader.

Not sure if you use the ‘advanced shutdown menu’ to be able to get into recovery, etc. from a running phone…