I had a wired cam v2 doorbell for 3 yrs with flawless operation and immediate response. I also have 11 other cams around the house that all work perfectly. A month ago my doorbell stopped connecting. I reset it, deleted it and reconnected, redid my router, hard reset the unit, made sure firmware was up to date until I finally gave up and bought a new one. The new one is doing the exact same thing. The router is 10’ from the doorbell with great connectivity, up to date firmware, all other cams are perfect. What do I do to make this work?
Welcome to the Forum, @dcrispino! 
What’s your transformer rating, and what kind of testing or troubleshooting have you done with things in the Video Doorbell v2’s electrical circuit (transformer, chime, wiring)?
The old Wyze door bell (the exact same model) worked perfectly for 3 yrs and then started having problems. Why would the transformer suddenly be a problem when it wasn’t a problem for 3 yrs prior and I also had a ring doorbell for 3 yrs before that with no problem. If it was the transformer, wouldn’t it just not turn on at all? It wires up, turns on, finds the wifi signal super strong, but just won’t show live videos after clocking for a minute it says disconnected.
#1 how do I check to see what transformer my door bell is (20 yr old house)?
#2 what troubleshooting things can I do besides resetting it via the app and hard reset with the pin poke in the back? I’ve also disconnected and reconnect it via the wires twice and it’s a brand new unit doing the same thing as the old one did.
My typical disclaimer: 
I am not an electrician.
Because of my own experience troubleshooting a problem with my Video Doorbell v2, because of problems I’ve read other community members report with these things that are ultimately determined to be power and/or wiring issues (often resolved by replacing/upgrading the transformer), and because power issues can cause any Wyze Cam or video doorbell to lose its Wi-Fi signal, I have an admitted bias toward investigating and resolving power and wiring issues to either address those or rule those out as the cause for observed connectivity problems.
My understanding of transformer failure is that performance can degrade over time and isn’t necessarily an all-or-nothing (sudden quit) thing.
You’d have to locate it. Typical locations include basement utility/mechanical rooms, near furnaces, near or adjacent to breaker panels, in closets (possibly near the front door of your home), and in the wall behind the chime. Some Forum users have reported that their transformers are in their attics. Your transformer will probably look similar to the photo in the Help Center’s Chime Compatibility Check article and should have its rating stamped or embossed on it.
For starters, I would check the voltage at the transformer with a multimeter, and I would also check the voltage across the wires at the doorbell button’s location. I would also confirm that the correct wires are connected to the chime terminals (i.e., if you have a typical mechanical chime, then I’d want to see that the wire connected to the TRANS terminal is actually coming from the transformer and that the wire connected to Chime Controller’s black wire is actually coming from the doorbell button’s location[1]).
What additional detail can you provide about this? My Video Doorbell v2 has no such pinhole for reset.
Also, what did Wyze Support say when you contacted them?
This was not the case with my chime when I originally installed my Video Doorbell v2, and it worked for months prior to developing problems, which I’ve documented in detail elsewhere in the Forum. The brief story is that my own troubleshooting revealed a wiring issue that Wyze Support never asked me about, and remediating that solved my problem. ↩︎
Disable WPA3 in router settings if it is enabled.
That’s a good suggestion, too, and I don’t always think to ask about that or suggest it. If the Wi-Fi source is set with something like mixed-mode WPA3/WPA2 enabled for security, then setting it to WPA2 only may improve connection reliability. 
Dude I just went thru the exact same thing and I was so frustrated I just gave up. I could still see with the other cams. But just tonight I figured it out. So when I would delete the device and then re add it the phone very quickly ran thru the setup as far as the WiFi and password were saved but I couldn’t get it to connect… Come to find out for whatever reason just the floodlight (my newest device) didnt update the password so instead of just quickly going thru the setup when it got to password I pushed the eye to show me the password and wouldn’t Uk it was my old password… Why it saved the old password who knows but I changed the password and BAM reconnected!! Hope that helps..
Welcome to the Forum, @hulsey080879!
I don’t think you’re describing the same experience that’s happening here, because I believe that if the app had the wrong password saved then @dcrispino’s Video Doorbell v2 wouldn’t connect and complete setup at all. I do think revealing the password and double-checking that is definitely a good idea if you’re finding that you can’t complete setup during the in-app device-add process, though.