Computer not powering down after successful shutdown

First issue is the computer not powering down after clicking shutdown, using sudo shutdown -h now and the alt + prntsrn + keys method.

Happens more often than not, sometimes the second attempt shuts down like it should but more often continues to reboot, forcing me to execute a shutdown then hold the physical power button while its on a black screen.

Have checked shutdown logs and seems to be shutting down successfully, making me think its potentially a hardware issue, however it is all brand new components. Maybe a motherboard BIOS update? wondering if anyone else has had a similar problem before I attempt that.

Have checked almost all of the threads on the first page of google regarding this, and had some short success for about a week after editing a shutdown file, but the issue is back. It now also hangs on the BIOS splash for 1-2 mins before showing the login screen, always after a hard power down but doesn't if i got lucky with a normal shutdown (pretty rare now)

Have had a dual boot for linux mint on my old pc for some time now, however this new build is full linux (yay) but this issue is slowly driving me mad.

Any advice / help appreciated!

System:
  Kernel: 6.8.0-48-generic arch: x86_64 bits: 64 compiler: gcc v: 13.2.0 clocksource: tsc
  Desktop: Cinnamon v: 6.2.9 tk: GTK v: 3.24.41 wm: Muffin v: 6.2.0 vt: 7 dm: LightDM v: 1.30.0
    Distro: Linux Mint 22 Wilma base: Ubuntu 24.04 noble
Machine:
  Type: Desktop Mobo: Gigabyte model: B650I AX v: x.x serial: <superuser required>
    uuid: <superuser required> UEFI: American Megatrends LLC. v: F30 date: 05/22/2024
CPU:
  Info: 6-core model: AMD Ryzen 5 7600 bits: 64 type: MT MCP smt: enabled arch: Zen 4 rev: 2 cache:
    L1: 384 KiB L2: 6 MiB L3: 32 MiB
  Speed (MHz): avg: 3917 high: 4952 min/max: 545/5170 cores: 1: 3657 2: 4942 3: 3397 4: 4463
    5: 4952 6: 4378 7: 545 8: 4938 9: 3662 10: 3686 11: 4930 12: 3462 bogomips: 91023
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Graphics:
  Device-1: NVIDIA GA104 [GeForce RTX 3060 Ti Lite Hash Rate] vendor: eVga.com. driver: nvidia
    v: 550.120 arch: Ampere pcie: speed: 2.5 GT/s lanes: 16 ports: active: none off: DP-6
    empty: DP-4,DP-5,HDMI-A-2 bus-ID: 01:00.0 chip-ID: 10de:2489 class-ID: 0300
  Device-2: AMD Raphael vendor: Gigabyte driver: amdgpu v: kernel arch: RDNA-2 pcie:
    speed: 16 GT/s lanes: 16 ports: active: none empty: DP-1, DP-2, DP-3, HDMI-A-1, Writeback-1
    bus-ID: 13:00.0 chip-ID: 1002:164e class-ID: 0300 temp: 39.0 C

Can post logs on request