Laptop stalls, kernel log flooded with "Allocating resources"

Hi,
I have experiencing this for a while now (1 year+), with the laptop (Thinkpad T430s) stalling at times, and often for a long period (hours). Even under very low load. In fact, the issue seems to affect input devices (mouse and keyboard, both external and built-in devices), as the screens continue to operate normally and receiving notifications from applications, such as Slack.

The /var/log/kern.log gets flooded with messages like:

Feb 15 13:40:12 fernando-ThinkPad-T430s kernel: [ 516.556167] pci_bus 0000:04: Allocating resources
Feb 15 13:40:13 fernando-ThinkPad-T430s kernel: [ 518.031745] pci_bus 0000:02: Allocating resources
Feb 15 13:40:13 fernando-ThinkPad-T430s kernel: [ 518.031756] pci_bus 0000:03: Allocating resources
Feb 15 13:40:13 fernando-ThinkPad-T430s kernel: [ 518.031814] pci_bus 0000:04: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 518.771217] pci_bus 0000:02: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 518.771230] pci_bus 0000:03: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 518.771291] pci_bus 0000:04: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 519.510986] pci_bus 0000:02: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 519.510999] pci_bus 0000:03: Allocating resources
Feb 15 13:40:14 fernando-ThinkPad-T430s kernel: [ 519.511058] pci_bus 0000:04: Allocating resources
Feb 15 13:40:16 fernando-ThinkPad-T430s kernel: [ 520.986362] pci_bus 0000:02: Allocating resources
Feb 15 13:40:16 fernando-ThinkPad-T430s kernel: [ 520.986374] pci_bus 0000:03: Allocating resources
Feb 15 13:40:16 fernando-ThinkPad-T430s kernel: [ 520.986435] pci_bus 0000:04: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 521.722015] pci_bus 0000:02: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 521.722026] pci_bus 0000:03: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 521.722068] pci_bus 0000:04: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 522.457759] pci_bus 0000:02: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 522.457771] pci_bus 0000:03: Allocating resources
Feb 15 13:40:17 fernando-ThinkPad-T430s kernel: [ 522.457807] pci_bus 0000:04: Allocating resources
Feb 15 13:40:19 fernando-ThinkPad-T430s kernel: [ 523.933552] pci_bus 0000:02: Allocating resources
Feb 15 13:40:19 fernando-ThinkPad-T430s kernel: [ 523.933572] pci_bus 0000:03: Allocating resources
Feb 15 13:40:19 fernando-ThinkPad-T430s kernel: [ 523.933638] pci_bus 0000:04: Allocating resources

Would the problem be linked to a driver that controls a pci device? A malfunctioning hardware part? Sometimes the issue is not noticed for days.

I should also note the disc is encrypted and even if I restart the computer, when Ubuntu starts loading and the prompt to enter the password to access the disk, the issue is already manifesting itself: I type the password and sometimes the key that is pressed is not sent, sometimes it is send twice.

Any other information I can provide, please let me know. Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-99-generic 5.4.0-99.112
ProcVersionSignature: Ubuntu 5.4.0-99.112-generic 5.4.162
Uname: Linux 5.4.0-99-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: fernando 2655 F.... pulseaudio
CasperMD5CheckResult: skip
Date: Tue Feb 15 13:45:42 2022
InstallationDate: Installed on 2019-10-28 (841 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
MachineType: LENOVO 23539KU
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-99-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-99-generic N/A
 linux-backports-modules-5.4.0-99-generic N/A
 linux-firmware 1.187.25
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-07-12 (583 days ago)
dmi.bios.date: 11/12/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G7ET63WW (2.05 )
dmi.board.asset.tag: Not Available
dmi.board.name: 23539KU
dmi.board.vendor: LENOVO
dmi.board.version: Win8 Pro DPK TPG
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG7ET63WW(2.05):bd11/12/2012:svnLENOVO:pn23539KU:pvrThinkPadT430s:rvnLENOVO:rn23539KU:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad T430s
dmi.product.name: 23539KU
dmi.product.sku: LENOVO_MT_2353
dmi.product.version: ThinkPad T430s
dmi.sys.vendor: LENOVO