Hi @Fabe55 This does seem not seem right as a small scratch not likely to cause this issue. However if deep scratches or dents are deemed to cause a malfunction then this results in the warranty being invalid. see some information here https://www.samsung.com/uk/support/mobile-devices/what-is-the-warranty-status-of-my-samsung-mobile-d...
General information on warranty here https://www.samsung.com/support/warranty/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.