This one's got me stumped.

Whenever the system is asleep for a long time, e.g overnight, the LAN driver reports error code 43 ("a problem") and turns itself off.

This has being going on for months, but I never caught the problem until now. The owner merely shuttles back to a restore point I set her when the machine worked.

Previously (without knowing exactly what was happening) I have tried everything to resolve this. Manually resetting the TCP/IP, fiddling with the driver Wake From LAN settings, DIFFERENT drivers, etc. etc.

The solution is easy, uninstalling and reinstalling the driver. Understandably, though, the user is uncomfortable with this operation and the problem persists.

What's causing it and how to stop it recurring? Any ideas?

Thanks in advance to this great community.

XP home SP3, Marvell Yukon 88E8056 PCI-E Gigabit Ethrnet Controller, version 10.22.7.3 (yk51x86.sys)