In situations like this, providing more detail can be helpful: camera firmware, app version, where you are in the app and what you’re doing at the time you see the error message, etc. Screenshots are good, too, as is an idea of your settings (i.e., whether you have the cameras set for Continuous or Events Only microSD recording).
If you’re seeing a message about the microSD card being unavailable when you try to view an item from the Events tab, then that’s a known issue that has been affecting some Cam Pan v3s (seems like it used to be seen more frequently on regular Cam v3s), and I’ve also seen reports of it affecting some Cam v2s. The typical recommended work-around at this time (until Wyze fixes it) is to try to view events from the microSD card recording timeline on the camera’s Live Stream screen. If you’re seeing an error elsewhere, then providing additional context here is useful to other community members trying to assist.
Mentioning the size might be useful, too, as smaller cards reportedly tend to wear out faster than higher-capacity cards. As @K6CCC indicated, using cards with better reputations for reliability may be helpful. I also like the SanDisk High Endurance cards and have used SanDisk Extreme cards in the past (256 GB capacity on both), and many Forum members seem to swear by Samsung PRO Endurance.
Having said that, I’d still consider pulling the cards from your cameras and using the SD Memory Card Formatter from SD Association to format the cards in a PC, especially if you think at least one of the cards has corrupt data. Generally when you pull one of these, you’ll want to navigate in the Wyze app to a camera’s Live Stream screen and then tap Settings ➜ Advanced Settings ➜ Manage MicroSD Card ➜ Eject MicroSD Card so that you don’t cause data corruption by pulling the card while the camera is attempting a write operation. Some people go as far as powering down their cameras, but I don’t think that’s necessary.
Welcome to the Forum, @rtedeschi! 