Hey neighbors! Depending on the pattern of the blue light it could be powering up (circling) or it may be attempting to connect to your wifi (upward motion).
If the Pro is showing a charging indicator, this could mean the power being supplied is not sufficient for consistent power or there may be some resistance in wiring due to thinness or corrosion. Please check the power supply is rated for 16 - 24 VAC.
Wifi signal strength is another great variable to check to ensure the Pro has a reliable wifi connection. If you are using the 5 Ghz frequency, I recommend switching to the 2.4 Ghz to see if that improves functionality. Let me know how this goes. 