Sync stopped in 1 minute after pause/restart

I’m syncing a folder having 7GB small files to google drive. It worked at the beginning but stopped. After pause/restart app, it restarted syncing but stopped again in 1 minute, and keeps working like this. It’s been two days and that folder is not done with syncing. Is this a bug or API limit? If it’s API limit, is there a way to use my own API with Insync?

Update: At the same time, the taskbar icon shows red exclaim mark, but no error in the Errors tab. Some files look stuck there, not synced, and occupying the 12 sync slots. It looks more like a bug than API limit.

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