Video Doorbell 2 won't reset

Our Video Doorbell 2 worked fine for about 3 months but now has lost connection with the internet and won't reset. It is hardwired to the old doorbell wiring which shows 15VAC. The doorbell still rings when you push the button. When I push and hold the black reset button the white lights go out for a few seconds but then they just come back solid white, they don't flash like it is resetting. I removed the battery and charged just in case, but the same thing still happens.