Hi,
Following the new release I sent this weekend, MyEcobee device should be able to run for weeks (and probably for months) without any auth issues (provided that the ST cloud backend is not failing on us) as I’ve implemented some extended watchdog workarounds so that My Service Manager can run despite the current ST scheduler issues.
If it’s not the case at your location, then you may some configuration issues that need to be solved.
I’m personally monitoring many user locations as some of my contributors have also bought some of my support packages at my store (in order to avoid dealing with upgrading to the latest version):
The support packages are available at my store:
http://www.maisonsecomatiq.com/#!store/tc3yr
These support packages allow the contributors to enjoy MyEcobee device without having to worry about any auth or refreshing issues.
In any case, the instructions provided with the last package sent this weekend should be sufficient for the watchdog configuration.
Regards.