Thermostat auto-fan setting not working

Hi.

I have the Xfinity thermostat linked to my Xfinity home security system. When on the Cool setting with the fan on auto, the fan does not turn on when the AC compressor starts. I have to switch to the manual fan setting in order to get air circulation. This is problematic to say the least.

Also the Xfinity android app does not seem to sync well with the system settings, thus giving erroneous readings.