I have now tried the 4.15.1 kernel a couple of days can say that the issue 
still remains, except that I do not get the pcie errors anymore. 
The good news is that I am pretty confident that this is a firmware issue and 
will try to upgrade the wifi firmware:

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  Wifi stops working on Del XPS 9360

Status in linux package in Ubuntu:

Bug description:
  I am running a a Dell XPS 9360 laptop and the wifi started to sometime "hang" 
this week after an update (not sure which one).
  Running Ubuntu 17.10 (upgraded from Gnome Ubuntu recently)
  $lsb_release -rd
  Description:    Ubuntu 17.10
  Release:        17.10

  I observed that five~ error messages like these popup from time to time in 
  [ 6000.482060] pcieport 0000:00:1c.4: AER: Corrected error received: id=00e4
  [ 6000.482082] pcieport 0000:00:1c.4: PCIe Bus Error: severity=Corrected, 
type=Data Link Layer, id=00e4(Transmitter ID)
  [ 6000.482095] pcieport 0000:00:1c.4:   device [8086:9d14] error 
  [ 6000.482105] pcieport 0000:00:1c.4:    [12] Replay Timer Timeout  

  A similar report exists for errors like this: 1521173 but not sure if
  it is related to the wifi problem. Most commenters in that report runs
  Realtek Wifi adapters while I have ath.

  Removing and adding the ath_pci module or disabling and enabling wifi with 
network manager seems to fix the issue for a while:
  $ sudo modprobe -r ath10k_pci
  $ sudo modprobe ath10k_pci

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-32-generic 4.13.0-32.35
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
   /dev/snd/controlC0:  niklas     3554 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sat Jan 27 12:11:31 2018
  HibernationDevice: RESUME=UUID=5eda62e7-dbb8-402c-b33b-311c418b4f78
  InstallationDate: Installed on 2017-09-27 (121 days ago)
  InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0c45:670c Microdia 
   Bus 001 Device 003: ID 04f3:2234 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 0cf3:e300 Atheros Communications, Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9360
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-32-generic.efi.signed 
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.169.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2018-01-20 (7 days ago)
  dmi.bios.date: 12/12/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.5.0
  dmi.board.name: 06CC14
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.

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