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Do we need to use the new refresh token after access token refresh even if it hasn't expired?

The request to refresh an access token also returns a refresh token, for subsequent access token refresh do I need to use the new refresh token even if the one hasn't expired yet? It seems to be the case. I'm trying to monitor my thermostat which loses internet connectivity on a regular basis and if I use the old refresh token (which hasn't expired) I keep getting "invalid_grant" error and need to re-authorize the application. thanks
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