I'm wondering if switching to a CAT7 cable from my existing CAT6 might help my situation, along with making the Ethernet setting changes mentioned above.
I have no problems with general internet connection with my eero 6Plus router and Mac Studio. But when I use the company VPN, there is apparently plenty of ConnectionTimeouts and packet loss that it drops the connection to the server constantly - even when the Mac is sitting idle (but not sleeping). It was so bad that I yanked the eero 6Plus router and put the old eero Pro router back in place and have no issues at all.