Happened to me just a few times in past week after never having this issue. Then, last night it happened 12 times in the first 13 holes of a Famous 18 club tourney. I cleaned caches after the 2nd hole, no help, and they had been cleaned the day before anyways. After the 13th, the final 5 holes were fine.
Using Firefox for the 487th day in a row.
None of the 12 freezes in the first 13 holes were on the green. Always tee or fairway. Sometimes I was able to complete a step or two before the freeze, (adjust spin, choose club, move marker, etc.), other times not.
Only two options, right click to bug report but no valid click to use the report, or X out and re-open game window.