Alternatively, I put the network Kexts in the 10.13 folder in the clover EFI partition
and it appears to have solved the same problem.
Edit: If I sleep and then wake again fairly soon afterwards, things still work. But if I sleep and wait a bit, ethernet does not work. Using appleethernet1000e v 3.3.6 on High Sierra.
SOLVED EDIT: I removed AppleEthernet100e.kext from /Library/Extensions and /EFI/CLOVER/kexts/Other & 10.13. I manually installed IntelMausiEthernet.kext in /Library/Extensions (and used terminal to refresh the kexts) and /EFI/CLOVER/kexts/Other & 10.13.
From
looking around, it appears that AppleEthernet1000e appeared to be working fine for a lot of us until 10.12 or 10.13, but IntelMausiEthernet seems to handle High Sierra better.