Wyze V4 killed 3 micro sd cards

Welcome to the Forum, @smbeauleau! :wave:

I believe that can happen with low-quality or counterfeit cards. What specific cards are you trying to use in your new Cam v4s, and what’s the source for the cards you’re using?

You may also want to take a look at this topic where Wyze is focusing on microSD card issues with certain Cam models:

Note that one of the data points requested in that topic is specific information about the cards being used, including photos of the cards themselves.

For the cards that you already have, you could also try verification tools on a PC (e.g., ValiDrive) to authenticate the cards’ actual capacities and may additionally wish to do an in-PC full/overwrite format of an affected card using the SD Memory Card Formatter to see if that helps with your issue.