Mu video doorbell pro cannot work, need help

My name is Kevin, I have a Video Doorbell Pro cannot work and need some help.I removed my Ring Doorbell from my Ring APP before, and the doorbell unit is still connected to my home network, but I cannot find a way to search the device directly from my network to add it back, the Ring app push me have to configure the doorbell unit from start over.OK, I pressed and released the small button on the side of doorbell unit, but it doesn't work at all. Two different situations as below:- Situation 1：I can hear the full voice prompt, the light of doorbell unit starts spinning and I can find the Doorbell AP network name ring-xxxx, but after about 10 seconds, the light stop spinning and the Doorbell AP network ring-xxxx just gone, I cannot continue to finish installation.- Situation 2：I cannot hear one word of voice prompt, then the doorbell unit just restarts automatically, and I found it's very hot.I sent several email to help@ring.com ask for help, but got no reply. Hope someone can help my doorbell back to work. Thanks a lot.