I'm having the same problem. I'm using Big Sur 11.1 on a Mac 27" desktop. When I have my external devices (monitor, hard drive) in use at the same time, I cannot have Photoshop or Illustrator open. The Mac will freeze, then shut down/restart. Premiere, Bridge, After Effects, Media Encoder works fine while the external devices are in use. So I don't know who to blame for the crashes. I've talked to Apple multiple times. Still troubleshooting. SN: I've had this Mac for a month now.