Configured VLAN. after restart, the Network freezes and cannot be recovered

Hello Community,
i'm having troubles with my iMac at Work.
i configured a VLAN to connect to my Network at work. whenever i do this, the network and part of the statusbar freezes.
i can recover  this issue by deleting the folder /Library/Preferences/SystemConfiguration
Clearly, this resets my Networkconfiguration and i have to reconfigure the VLAN. otherwise i cannot connect to the internet.
But as soon as i restart my system, the problem occurs again.
Thanks for help in advance.
  Modellname:                    

I don't remember exactly, probably within the last month, as I had just replaced the display on this phone and started using it a couple weeks ago. I rebooted into safe mode and still have the same problem. I can change time, date, am/pm and as soon as I click done, it shows the same wrong info.
'IN GOD WE TRUST'
>> Personal information/e-mail reply/headers removed to comply with the Verizon Wireless Terms of Service <<
Edited by:  Verizon Moderator

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