For the Z Flip 3 - I haven't heard about this problem as much.
My missus has been using one for about 2 months now and no issues have happened.
I high recommend reaching out to Samsung Support and they can fix this issue for you :)
Hi @luckster, do you have images of the issue?
For more information on how to back up your device: https://www.samsung.com/au/support/mobile-devices/back-up-samsung-device/
To book an appointment prior to heading in-store or to drop off your device via Australia Post: https://www.samsung.com/au/support/your-service/main
To find your nearest store: https://www.samsung.com/au/samsungstore/