High Sierra and Router DHCP Issues

I’ve purchased two new routers in the past couple of weeks due to the fact that Comcast increased my Internet speed and I needed the new high speed protocols to take advantage of it..

Both routers have crashed due to IP address conflicts... On both routers (one a Netgear, the other a Linksys) my MacBook Pro running High Sierra 10.13.1 has all of a sudden started generating IP address conflict error messages... One message will say the conflict is: “Another unit has 192.168.1.120”, a little later the error message will say: “Another unit has 192.168.1.130”...

Both routers were reset to factory settings multiple times and re configured... Same result.

I‘ve spent a frustrating amount of time on the phone with technical support with no resolution...

I decided maybe the MacBook was the problem so I gave it a dedicated IP address below the DHCP range of the router. So far the router (Linksys AC1750) is happy and all is well...

Anyone have any idea why the macbook is causing problems??