I have upgraded to latest big Windows 8.1 update (April) and since then I am having issue with my Ethernet connection. Normally connectivity is intact, but if power goes off and router turns off or if router is rebooted , the system fails to identify the lan network. I have tested the router in windiows 7 system with no issues. I am running the driver for Qualcomm Atheros AR8151 NDIS 6.30 Driver version 18.104.22.168 http://www.qca.qualcomm.com/drivers/AR813x_AR815x_AR816x_v22.214.171.124_WHQL.zip I have tried uninstalling all my security apps and still problem exisits. I guess the issue is driver incompatibility (?) Anyone facing the same issue or has a solution to it?