P2422HE, USB-C, network card loses DHCP

Hi,

In our organization we have problem with many DELL P2422HE. In random time network connection by built-in hub monitor network card is lost. Speed solution is connect to this monitor other laptop and back connect default machine with not connect to internet. Its very hard to help our users when we have many remote localizations. Connection lose look like network card can't get ip address from DHCP (our DHCP server work correct also), connection light in back of monitor in network socket is blinking ok.