Whole system down

So i have had 2 ring doorbell pros hooked up for 3years and no issues. I decided to buy 2 new ring doorbell pros just to replace older worn ones. Hooked them up and no power. Check power and it was good but decided to go ahead and buy new transformer from ring the 16v 30vac. Installed and system came up without issue. After about 2 hrs the mechanical chime melted. So i tried bypass with power kit v2 still no power. Checked voltage at transformer and its still good. Connected rings back and no power at transformer. Disconnected ring and have power at transformer again. What is issue?