So yesterday after riding for about 3 hours my 800 XC just died. wouldn't start, tried several times. sat for about 5 minutes and I removed the gas cap and it had a lot of pressure in the tank. Put the cap back on and it started right back up. Has anyone else had this problem?  I don't think it should have had that much pressure in the tank. Surely the tank is vented somewhere. Seems like it vapor locked or something.

Search the forum for "hot stall".  I think there is a video of how to do the evap canister delete.  I had the same problem with my 2019, dealer told me that they didn't realize that they hadn't done the delete process before they sold it to me.  After they did the procedure (not entirely sure exactly what they did, but did state it was disabling the evap system).  Have not had the issue since then.