Hmmm.
I wonder if you two guys are using Xbox versions with different amounts of memory, since Microsoft is doing this "high/low" model for consoles.
My PC hasn't seen stability issues with Starfield, but it's high-spec: has 24GB VRAM, 128GB RAM, running off NVMe, and a high-end CPU.
A response to me says that someone is seeing a bunch of stability problems. They said that they were running it on a PC below minimum required specifications.
An XBox Series S has 10GB of combined VRAM/main memory and an XBox Series X has 16 GB. That's a a substantial difference between the two versions.