Yeah, what I’ve found is, if I step away from the desk long enough for the MBP16 to sleep, when I come back, the cursor & performance will be laggy, fans will be cranking like mad, drives won’t eject, and it’ll eventually hang & crash when you inevitably reboot. When it does reboot, I notice some graphical sputtering and gagging getting back to the desktop. This is still an unstable boot, and the same problems will be present. So I reboot again right away, and then it works like it should.
I turned off power-nap yesterday afternoon and thought that might have fixed it, but it’s hard to tell since Keyshot crashed it twice on its own since then. I joke that all my reboots since buying this computer are actually hangs and crashes, while the old 2009 MBP17 acts like a server and CNC machine control 24/7 and hasn’t been rebooted once since Sierra went on it.
I looked into people’s attempts to put Mojave on the MBP16, and of course the sticking point is the missing graphics driver. Apple could cure a lot of woes by doing something unusual for everyone who spent a fortune on these MBP’s and needs a stable release, by issuing a late update to Mojave with the graphics drivers we need so we can upgrade to (or past) Catalina when it’s mature instead. But obviously that’s as unlikely as it is.