I have a Linksys WRT1900ACS loaded with openwrt/wifidog and configured as a guest hotspot for a customer.  LAN cable goes from the Linksys WAN port to one of the LAN ports on the HG659.  Its been working fine for about a year, however just recently the Linksys started dropping its link on the WAN port, the link led randomly goes out to indicate no cable plugged in, however the HG659 link led remains on for the particular LAN port its plugged into.  The Linksys needs to be power cycled to get a link back on its WAN port.  Has anyone else experienced similar problems with any devices plugged into an HG659 ?  Ive tried a brand new Linksys, brand new LAN cable between the two and get the same issue.  Plugging the Linksys into other broadband router's (including a Spark HG659) there's no issue (I haven't tried another Vodafone HG659) - I'm thinking Vodafone have sent out a firmware update and broken things here?