I know Wyze is already aware of this bug and working on it (thanks WyzeJasonJ for passing the information on to the appropriate team), but it seems we should report it here anyway for all those struggling with this issue still.
Cards up to 128GB work fine with exFAT format, but larger cards (256GB, 512GB, etc) in exFAT will only record video for a small amount of GB before it stops using the card (I have seen reports for limits of 20GB, 30GB, 84GB, 100GB). --Some users report that formating larger cards to FAT32 makes them work as normal, but even if this is the case, the issue should still be addressed/resolved.