I have the same issue.
Unfortunately it's now Ubuntu 20.04 and kernel 5.4.0 and it still happens.
My laptop is Lenovo Thinkpad T440p.
First issue that was happening all the time was that the touchpad didn't work 
after waking from suspend. But it was better known issue with some fixes with 
the help of some scripts.
This is harder as it's now happening always but only sometimes and I haven't 
figured out robust steps to reproduce this issue. It just happens sporadically 
but when it happens only hard reset helps.
My laptop has also Intel CPU and nVidia graphics card so that's something that 
is common I suppose.
If anything else is needed I could provide more information.

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  Suspend fails in Kubuntu 18.04 but works fine in Kubuntu 17.10

Status in linux package in Ubuntu:

Bug description:
  After upgrading to kubuntu 18.04 resuming from suspend fails in most
  cases on my laptop. When trying to resume the power LED is turned on,
  but the screen stays black and the system does not respond at all.
  Switching to another virtual terminal is not possible and closing the
  lid again does not show any effect. The hardware is a Dell Latitude
  e7440 with core i7 4600U and intel graphics only. The only way to
  change the status is a hard shut-down by long pressing the power
  button. The last message in kern.log is:

  PM: suspend entry (deep)

  The described problem is similar to bug #1774950. However, the latter
  is considered to be fixed with kernel 4.15.0-38 while my problem
  persists with this kernel.

  Output of 'sudo lspci -vnvn' is attached, the result of 'cat
  /proc/version_signature' is:

  Ubuntu 4.15.0-38.41-generic 4.15.18
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
   /dev/snd/controlC1:  graeser    2116 F.... pulseaudio
   /dev/snd/controlC0:  graeser    2116 F.... pulseaudio
  CurrentDesktop: KDE
   # This is a distribution channel descriptor
   # For more information see 
  DistroRelease: Ubuntu 18.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=none
  InstallationDate: Installed on 2014-03-20 (1690 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 
  MachineType: Dell Inc. Latitude E7440
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic 
root=UUID=25e09413-4977-401f-a034-0465b444518b ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
   linux-restricted-modules-4.15.0-38-generic N/A
   linux-backports-modules-4.15.0-38-generic  N/A
   linux-firmware                             1.173.1
  Tags:  bionic
  Uname: Linux 4.15.0-38-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-10-15 (20 days ago)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/02/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 0WK2DM
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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