[Solved] WiFi / Ethernet not working, only USB Tethering

[Maffin]

Hi!
I've installed Debian 12 for the first time, and I cannot use it properly because both Ethernet and WiFi have a 70%+ packet loss and I'm struggling to fix this issue.
I've already made sure that the problem is not DNS related by using

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ping -c3 8.8.8.8

Here's some info that might be useful to solve this issue:
iwlwifi kernel logs:

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user@debian:~$ sudo dmesg | grep iwlwifi
[sudo] password di user: 
[   19.968224] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
[   19.977397] iwlwifi 0000:00:14.3: firmware: direct-loading firmware iwlwifi-so-a0-hr-b0-72.ucode
[   19.977424] iwlwifi 0000:00:14.3: api flags index 2 larger than supported by driver
[   19.977460] iwlwifi 0000:00:14.3: TLV_FW_FSEQ_VERSION: FSEQ Version: 0.0.2.36
[   19.978185] iwlwifi 0000:00:14.3: firmware: failed to load iwl-debug-yoyo.bin (-2)
[   19.978271] iwlwifi 0000:00:14.3: firmware: failed to load iwl-debug-yoyo.bin (-2)
[   19.978327] iwlwifi 0000:00:14.3: loaded firmware version 72.daa05125.0 so-a0-hr-b0-72.ucode op_mode iwlmvm
[   20.046826] iwlwifi 0000:00:14.3: Detected Intel(R) Wi-Fi 6 AX201 160MHz, REV=0x370
[   20.164069] iwlwifi 0000:00:14.3: Detected RF HR B3, rfid=0x10a100
[   20.231526] iwlwifi 0000:00:14.3: base HW address: f4:46:37:ac:7f:0b
[   20.307951] iwlwifi 0000:00:14.3 wlo1: renamed from wlan0

lspci output:

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00:00.0 Host bridge: Intel Corporation Device 4649 (rev 02)
00:01.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x16 Controller #1 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Alder Lake-P GT1 [UHD Graphics] (rev 0c)
00:04.0 Signal processing controller: Intel Corporation Alder Lake Innovation Platform Framework Processor Participant (rev 02)
00:06.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 Controller #0 (rev 02)
00:06.2 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 Controller #2 (rev 02)
00:07.0 PCI bridge: Intel Corporation Alder Lake-P Thunderbolt 4 PCI Express Root Port #0 (rev 02)
00:08.0 System peripheral: Intel Corporation 12th Gen Core Processor Gaussian & Neural Accelerator (rev 02)
00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring Technology (rev 01)
00:0d.0 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 USB Controller (rev 02)
00:0d.2 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 NHI #0 (rev 02)
00:14.0 USB controller: Intel Corporation Alder Lake PCH USB 3.2 xHCI Host Controller (rev 01)
00:14.2 RAM memory: Intel Corporation Alder Lake PCH Shared SRAM (rev 01)
00:14.3 Network controller: Intel Corporation Alder Lake-P PCH CNVi WiFi (rev 01)
00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)
00:15.2 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #2 (rev 01)
00:16.0 Communication controller: Intel Corporation Alder Lake PCH HECI Controller (rev 01)
00:1f.0 ISA bridge: Intel Corporation Alder Lake PCH eSPI Controller (rev 01)
00:1f.3 Audio device: Intel Corporation Alder Lake PCH-P High Definition Audio Controller (rev 01)
00:1f.4 SMBus: Intel Corporation Alder Lake PCH-P SMBus Host Controller (rev 01)
00:1f.5 Serial bus controller: Intel Corporation Alder Lake-P PCH SPI Controller (rev 01)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (16) I219-LM (rev 01)
01:00.0 VGA compatible controller: NVIDIA Corporation GA106M [GeForce RTX 3060 Mobile / Max-Q] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GA106 High Definition Audio Controller (rev a1)
02:00.0 Non-Volatile memory controller: Intel Corporation SSD 670p Series [Keystone Harbor] (rev 03)
03:00.0 Non-Volatile memory controller: Shenzhen Longsys Electronics Co., Ltd. Lexar NM620 NVME SSD (DRAM-less) (rev 01)

I'm running on a fresh installation of Debian 12 with Linux 6.1.0-20-amd64.

Hope you can help me! I wanted to switch to a more stable distribution, but it's the first time I've encountered such an issue with my laptop.

Thanks in advance!

---- SOLVED ----
I'm ashamed to say that I wasted 3 times complaining about my hardware & my software only to discover that it was my housing provider rate limiting my MAC address... I'm really speechless.
I want to thank everybody that took their time to read & maybe think about a possible solution to such issue.

[ruwolf]

Can you see related errors in journal (of systemd)?