If you are plugging a portable USB-C powered monitor into a Framework 16 laptop and the monitor keeps rebooting ... it's not getting enough power.
You have to use a USB-C module that's plugged into one of some specific sockets -- the two four "furthest back" on either side, kinda closest to where you would normally expect to power a laptop. The front two won't work.
And: "Ports 1,2,4,5 are shared on a first come first serve basis. So they are 1.5A by default, but one port from any of these can negotiate 3A over PD. Once that is taken, the other ports are limited to 1.5A. Ports 3,6 are 900mA."
There's a flyer that comes in the box about this, but I didn't make the connection (pun intended) until the symptom popped up.
And a KB article:
https://knowledgebase.frame.work/expansion-card-slot-functionality-on-framework-laptop-16-rkUjGm7cn