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OP
My job back in the 80's was lead, to install 200+ Sun Workstations on a thick Ethernet (10base5).
If your IP is changing. Something is causing that.
You did not say if your PC was wired or wireless. Many DHCP servers are set to limit the assignable IP (mine was 16 as delivered), the rest are static addresses OUTSIDE the DHCP block.
If you have a lot of folk using your connection, your DHCP lease gets bumped if not in actual use (traffic).
Comcast has a program, where other Comcast users can roam and use routers (they are DMZ'd from your internal LAN) if the have the app and log it into THEIR account.
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