Is your Google Calendar often disconnecting form your CoachAccountable account? It's likely that the token allowing CoachAccountable to access your calendar has been revoked. When CoachAccountable recognizes that it's no longer allowed access, it will automatically sever the connection.
A reset of the connection can fix this.
From within your Gmail click on your avatar in the top right, then the big "Manage your Google Account" button.
From the page that opens, go to Security >> Third Party Apps With Access and click "Manage third-party access". Click on CoachAccountable, and click "Remove access".
THEN resync from within CoachAccountable, and you should be good to go.