Reason for intermittent connectivity
Plume Networks optimise on a regular basis to ensure a location is functioning optimally. During this process, we may change channels on either 5Ghz or 2.4Ghz, or both bands based on various factors. Ecobee fails to switch to the new channels after optimisation. This causes the device to disconnect and at times, fail to connect back until Ecobee is manually reconnected to the WiFi network.
Solution
We have escalated the matter to Ecobee, who have released firmware to address the issue.
Ecobee has released a new firmware version 4.2.0.171 for their Ecobee 4 devices. If you have Ecobee 4, then please ensure you are running this firmware at the minimum to mitigate the issue.
Ecobee has released firmware version 3.70.992 for their Ecobee 3 devices that address the issue with channel changes. If you have Ecobee 3, then please ensure you are running this firmware to mitigate the issue.
Ecobee has confirmed that firmware 3.8.0.501 for Ecobee 3 does not contain the channel change fix but are working on a newer firmware that will address the issue.