flickering in Gnome after upgrade from Gnome Ubuntu16.04 to 18.04

[sgwebb-us]

I had upgraded my PC from 16.04 to 18.04 and now in GNOME only I get flickering. It happens around the windows, tile bar and when I am in application moving from one screen to the next it will flicker back and forth. This issue does NOT happen in cinnamon, so I had thought it might be something with gnome extensions but it persists even after removing them.

Here is a video that describes a portion of the issue. After a time it seems to settle down but if I were to move a window it happens again.
https://photos.app.goo.gl/gTkft4kreqedCt8x5

I have reinstalled the nvidia drivers I am using a GT 710 that worked perfectly in 16.04 .. any help / pointers would be greatly appreciated.. I have tried everything I can think of .. and I am puzzled as to why it is only in GNOME ..

[sgwebb-us]

cat /etc/X11/xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 390.77 (buildd@lcy01-amd64-022) Thu Sep 6 07:51:39 UTC 2018


Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection


Section "Files"
EndSection


Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection


Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection


Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection


Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Sceptre U435CV-UMC"
HorizSync 30.0 - 80.0
VertRefresh 30.0 - 76.0
Option "DPMS"
EndSection


Section "Monitor"
# HorizSync source: unknown, VertRefresh source: unknown
Identifier "Monitor1"
VendorName "Unknown"
ModelName "Sceptre U435CV-UMC"
HorizSync 0.0 - 0.0
VertRefresh 0.0
Option "DPMS"
EndSection


Section "Device"
Identifier "Device1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GT 620"
BusID "PCI:1:0:0"
EndSection


Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GT 710"
BusID "PCI:3:0:0"
EndSection


Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-1"
Option "metamodes" "nvidia-auto-select +0+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection


Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
Option "Stereo" "0"
Option "metamodes" "nvidia-auto-select +0+0 {AllowGSYNC=Off}"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection