I have been following the issue regarding Ethernet cable and wifi connection problems with many manufacturer's PCs FOLLOWING the UPGRADE to WINDOWS 8.1. One doesn't have to survey Microsoft's support site and other third-party tech forums to see this is a large and growing issue. MANY users have PCs and laptops from ACER and numerous other companies that utilize the Broadcom Netlink (TM) Gigabit Ethernet chipset and these users are posting the same symptoms and issues surrounding the loss of speed or (mostly) dropped connections that were never experienced prior to the upgrade.
In checking with other users and their Laptop models, I have read and heard that any update to the Broadcom Netlink (TM) Gigabit Ethernet driver does not exist. Numerous other driver updates are posted here in the ACER support site but nothing regarding the Ethernet driver.
To me, it is not an issue with ACER nor with any of the other OEMs utilizing the Broadcom chipset. However, there are no updates posted by Broadcom and Microsoft appears to be referring users to the OEM's support sites to get any new or updated drivers. I think we are in a old-fashion "black-eye syndrome" where neither company is taking possession of the problem.
Sending ACER fans and users to the Driver update page WITHOUT any new information/fixes for this ethernet issue is not consistent with ACER's reputation and quality. I would hope that ACER SUPPORT will take further actions to help remedy this ethernet issue very soon!