resumes immediately after suspend

[bricedebrignaisplage]

When I press suspend or close the lid, it suspends for a few seconds and then resumes. If I don't notice it and put it in my bag, I end up with a burning hot laptop.

This happens very often, but not always. So there are some conditions that trigger it. Interestingly, I just spent a month working from home and it never happened then. Some of the differences I can think of are:
- I have an NFS mount which is not mounted then when I am at home, except if I am on the VPN. Whereas at the office I am either on wired ethernet or the companies wifi
- at the office I use synergy to control my workstation. However I have tried killing synergy before suspending and that did not help.

Something else possibly related I have noticed is that the fan is often blowing hard for no apparent reason.

I have a Dell Precision M3800 Laptop, with a GK107GLM [Quadro K1100M] NVIDA graphics card, proprietary nvidia drivers and bbswitch installed.

I also suspect the graphics card driver and bbswitch in that case, however I can't see why this would work better when I'm working from home.

I am sorry for the very vague description, please let me know what other information I can post.

product: Dell Precision M3800 (Dell Precision M3800)
vendor: Dell Inc.
version: A08
serial: 4BGSK32
width: 64 bits
capabilities:
 SMBIOS version 2.7,
 DMI version 2.7,
 32-bit processes
configuration:
 boot: normal
 chassis: portable
 sku: Dell Precision M3800
 uuid: 44454C4C-4200-1047-8053-B4C04F4B3332

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.4.0-63-generic 4.4.0-63.84~14.04.2
ProcVersionSignature: Ubuntu 4.4.0-63.84~14.04.2-generic 4.4.44
Uname: Linux 4.4.0-63-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Feb 14 13:22:05 2017
InstallationDate: Installed on 2016-10-10 (127 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lts-xenial
UpgradeStatus: No upgrade log present (probably fresh install)

[bricedebrignaisplage (brice-brice)]

maybe as a first step somebody could provide guidance on how I can flesh out this bug report. e.g. right now I cannot suspend my laptop, is there some log I can post here to help narrow down the issue?

[bricedebrignaisplage (brice-brice)]

I noticed that if I close the lid, wait for it to suspend, and then remove the usb ethernet adpater, all is fine.
But if I close the lid and remove the adapted immediately it will auto resume. And if I remove the adapter first and then close the lid, as well.
Does this mean that there is an issue with the driver for that USB adpater? Or network manager? Or NFS (all sorts of weird issues with NFS..)