I've not noticed a lot of outages. However, they do provide a running Incident History:
https://status.ecobee.com/history
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https://www.theverge.com/2019/6/3/1...eview-alexa-announcement-price-specs-features
"The new remote sensor is nicer to look at than the prior model, but I’m disappointed that it doesn’t add the ability to measure humidity; it still only measures temperature and detects motion. The system also still takes a long time to switch between home and away modes, even when it hasn’t detected any motion activity for over an hour on any of the sensors, which has been an ongoing frustration with the Ecobee for me."