Since yesterday's update, the game has crashed consistently after 1-60 seconds of play.
Does it matter what you are doing (combat or not, standing still without opening the inventory, etc), or where (near NPCs or surfaces, outdoors or a small interior, etc)?
So far this issue has not been reproducible. QA is continuing to test combat in the Switch version, but if anyone has saves they can provide, especially any saves where crashes are more frequent, or where there are particular actions that can be taken to (at least somewhat reliably) cause a crash, please do so.
If you have such saves, but don't have the Steam version to use the cross save feature, please contact support anyway.