Panic Report after High Sierra upgrade

Hi There,

I upgraded yesterday my MacBookPro (Retina, 13-inch, Mid2014)(2,8GHz, 16GB 1600MHz) to High Sierra. Since then it is highly unstable. I experience panic report and can stay in a session logged in between 2 seconds and 5 minutes. Some programs do not even start up anymore (like Mail). This is what I am getting :

And this is the first part of the panic report I managed to capture a couple of times. Not easy because most of the time clicking on report button triggers the 'crash' and pops up the message above.

Safe mode does not make a difference. I reinstalled High Sierra twice by pressing Command + Option + R while the Mac boots to start up the recovery system over the Internet. I did not get any error messages during the installs. Disk has been checked in Disk Utility. It is clean.

I am open to any suggestions. I would hate to format the hard drive to start from scratch. So if there is anything that can pull me out of this misery, please let me know.

Rgds.

Erik -