Display seems dark, sleep mode shortcut not working and wallet set up doesn‘t work

I got a brandnew fenix 8 amoled 51mm, and I have following issues: Even though the display brightness is at a maximum it seems pretty dark sometimes. SW version 17.30. Also, sleep mode short cut doesn‘t work properly. After executing it, it just shows the current sleep mode status instead of switching it to the opposite one. Furthermore, I can‘t link my bank card to wallet anymore. However, this might be related to my bank or something.