I am pleased to report that this problem has been resolved, as the problem has not recurred for 3 weeks. I have found a later version of Driver version 10.24.1208.2017 for Realtek PCIe GBE Family...

I have tried all sorts to resolve this mysterious failure, including actually make this PC Ethernet port be a static IP with renewal time increased to 1440. And disabled IPv6. It seemed to...

@try2bwise Well the gremlin seemed to revive after being dorment for around a week or so. Though I can tolerate and live with this situ, I wondered about two potential contributing factors: 1. I...

@ArcherC8 First, Thanks for your continued interest and dialogue! All physical components seem to be proven fine as have been tested including materially swapped. Attached below is a speedtest...

@IrvSp First: thanks again for staying on this and responding! Let me summarize again as simply as shown in the attached file of screen print. I have only one AC1750 as the router, there is no other...

@ArcherC8 First, thanks for your respond! Yes, I have. Please note that the same cable connected drectly to DOCSIS3 broadband Modem accessing Internet fine, which is another test and proof. Now when...