Help diagnosing wired ethernet that drops out

here is my build details

I’ve had 0 luck getting my build’s ethernet working. I’ve tried various builds of the intelmausiethernet.kext including the latest release. I’ve tried it on the USB EFU, boot drive EFI, and installing to L/E. I’ve cleared kext cache each time.

What happens is, the computer starts, the internet works right away (fast.com for example) download speeds are moderately fast. But as it’s running the test, after about 10 seconds, the speed drops to nearly 0 kbps. It never goes back to being fast until I restart the computer.

Would love some ideas to diagnose. Thanks!

submitted by /u/i_just_have_no_idea
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