I have 3 wrvs4400n routers with the .12 firmware that keep reverting to factory defaults usually upon rebooting for a settings change. I can't get them to consistently do this, but it's happening enough to cause major problems with the 3 sites where they are located. All 3 are less than 2 months old. I thought this was a problem with the .13 firmware, but it is still happening after downgrading to .12. Is anyone else having this issue?