Try the following to see if it helps:
Add the following line to the Debug tab in the DaVinci Resolve Preferences widget, then save, then exit Resolve and relaunch.
System.Record.Lookahead = 5
Also – can you send a log captured immediately after a hang to our help email – davincihelp (at) blackmagic-design.com
/Library/Application Support/Blackmagic Design/DaVinci Resolve/CaptureLogs.app