||I am back:)
I have a suggestion if you still face this problem.
There is a "Preview" button in Review Scoreboard page,before you click "Save" buttons,you can click "Preview" button to check the Preview page.
If Preview page can open fine,you can click "Save".
If Preview page can not be opened,you may also get problem when click on "Save" buttons,you need to wait and check "Preview" page later.
You can also save the Preview page into your local folder,it can be used to compare the current Scoreboard's Preview page which is not save yet,you can find the missing saved comment easily.
If the problem is too often to happen,you may need to use a VPN to help.