I am having resets too.
It always happens when I am scrolling through content menus or settings menus, but rarely during playback of content.
It happens about every 60-120 seconds (no joke) when scrolling though menus and lists.
It happens when browsing local content from my WHS.
It happens when browsing network content, apps, movies, etc. Pretty much everything.
Screen goes to a boxee logo, then says "connecting" then back to the main menu.
I originally thought it just happened on a "click" of the remote, but it happens when I am not scrolling too.
I was able to watch a 42 minute tv show with no problem though.
I am on a wired network, gigabit.