I have 12 Wyze cameras. I don't have much problem of them hanging. But periodically they will not become available and need to be rebooted. Those seem to be the ones furthest from a wifi access point. I put a smart plug on those so I can reboot them anytime if needed. I use Sandisk SD cards. Most have 32gb but 3 of them have 128gb. I don't know what you mean by oxidizing. They're plastic. I'm very happy with them. I don't regret wired. However, there is one place that I used a Blink XT2 because it wasn't easy to get a wire to that spot. Blink isn't reliable catching motion so I'll eventually get a wire there. These cameras only connect to 2. ghz. My wifi mesh system (Google/Nest) supports both so it's not a problem. These are very easy to setup.