I know a lot of people are having this issue. I have updated to 2.2 and downloaded the 3.3.2 image. I have done everything listed including download the new image. I have 4 options on standard (FTP, Video Codecs, Nito and Couch Surfer) that are all checked and 4 options on Advanced that are checked (XBMC,iScripts, MediaCloud and Disable Auto-Update). Should one of these not be checked?
I unclicked all of the advanced options and then it seemed to work. I have had no reboots yet.
The Media Cloud seems to have a conflict with certain networking devices, resulting in symptoms similar to what you are describing.
Un-check the Media Cloud plugin, and reinstall.