No crashes here either it used to in the beginning when saving, but there was some update that informed you " save world in 20 secs " to prep you to stop doing what your doing thats helarious like your in a battle and stop as the save will pause your game for a sec likely causing a crash.
You may need to look into how many buildings do you have clustered together are you playing SP or MP since MP seems to have problems with too many buildings.

Try playing in exclusive windowed mode
Make sure Valheim is closed.
Open Steam.
Right-Click on Valheim in your library and select properties.
Copy the following command and paste it into the launch options box at the bottom of the General section: -window-mode exclusive
Close the window to apply the changes.