Hello,
I have been experiencing similar issues with my Sony VAIO laptop. My problem was a bit different, and perhaps less severe, as I was only losing "upload" after Sleep Mode. It started about a week ago, and I ended up doing a "reset of LAN adapter" as a temp fix
every time. I also tried almost evrything, to no avail. It seems the problem is somewhere in Power Management.
What (strangely) has appeared to work for me, was going into Device Manager, pulling up LAN adapter, and going into Properties, then Power Management, and
checking "Allow the computer to turn this device off to save power".
What was strange was that after the first time doing this, I cam out of Sleep Mode with no connectivity issues. However, the 2nd time, I lost ALL connectivity (both LAN and wireless!). I had to reboot my modem and router, shut down and reboot of course. Everything
came back thankfully.
However, I tried this again, and so far it seems to be working. Although now I have noticed some strange changes in my computer. For example, this morning the computer was in "VAIO Optimized" power config..??? I had to reset to High Performance, but this was
very odd.
So, perhaps there is something here. I'm not sure what is causing the issue, perhaps a line surge did something I am unaware of at this point.