There should not be issues with IP addresses...
You need to check your local setup for that and not find the reason on DP-558 or PC-Link
In most cases, when DP-58 or PC-Link renegotiate the lease for a IP, most likely it does
not get an answer after which it does not get new data or new lease...
Well, something like that

In all DHCP software/Hardware you can enter fixed leases P Adresses so tht the player
and PC Link still have DHCP, but the address is fixed on the DHCP server...