This problem seems to have resolved now. I found some blank rows in the Google Sheet. These were caused because I turned on the ability to delete items in the Glide app. I then recalled the blank rows create issues. I fixed this by adding data to the first column of each blank row and now the sync happens within a few minutes as previously. Sorry to bother everyone.
Seems the delete row isn’t the issue with auto sync stopping. I just discovered this morning my sheet is not auto synching with glide table yet again.
I am on a Free Legacy plan.
Should I delete the glide deleted rows from the google sheet perhaps? Or will that just cause another issue?
Miraculously synching has recommenced today and occurs with minutes of a new row being added. No response from support but guessing they fixed something in background. Do do do do!