Update:
I captured the following on a thermal camera:

The dark red is U10, the other red component is U5.

My VOXL 2 Mini does not seem to boot. I am powering it directly from a 3.8V lab power supply connected to the J1 power connector. This method was working well for many weeks.
Recently, the VOXL does not seem to boot up. When I turn on my supply, I see the VOXL draw a steady ~1.1A @ 3.8V. I hear a whirring sound coming from the board. The power good LED D1 is steady on, and so is DS2 (green). Any ideas?

@Vinny Thanks for all the info.

@Vinny Thanks for the reply. We have a powered USB hub like this. One plan I had was to plug our powered USB hub into the MCBL-00022-2 and then plug the two Bosons into the USB hub. Do you think this would work? (We are just doing testing on a lab bench and would like to see if VOXL 2 mini with multiple USB cameras is viable, hence the possibility for this bulky/heavy setup.) We'd probably be able to make a custom adapter to power the Bosons externally in the future.

On the topic of the USB OTG functionality, let's say I just want to use one single Boson camera and plug it into the J9 USB-C port. Would you expect that to work?

I am trying to run two FLIR Boson 640 USB cameras simultaneously on VOXL 2 Mini.

When I plug a camera into J9 USB-C port, I don't see it recognized as a USB camera device under lsusb. I can't seem to start voxl-uvc-server, etc. Normally when plugged into J3, I see the camera show up as ...FLIR Systems...

Is the USB OTG functionality on VOXL 2 Mini supposed to work automatically? That was my understanding based on my forum research.

Also, one interesting thing to note is that when I plug in the Boson to J9, I do actually see two more entries listed in lsusb, but they're not what I expect. The two entries are both "Linux Foundation root hub"

Any advice? Thanks.