Delayed Ethernet Connection

Hoping someone here can help with an issue I recently started having.

I have Xfinity's CGM4140COM gateway and the 1000 Mbps speed plan. I have my 1-year old HP deskstop, running the latest version of Windows 10, connected directly to the gateway via ethernet. About a week ago, I noticed that whenever I awaken the HP from the sleep mode, it takes 10-15 seconds for the PC to connect to the internet. Up until last week, the PC would connect almost instantaneously. I've rebooted the PC and power reset the gateway. I ran the Xfinity Speed Test just for the heck of it, and it's fine.

I'm wondering if this is more of a Windows, HP, driver or settings issue, rather than a gateway issue?

While it's not a major issue, it is kind of a pain when you're used to just hopping on the keyboard and jumping on the internet. Waiting a few seconds is not big deal, but 10-15 seconds isn't right.

Anyway, would welcome any thoughts/input out there.