I had a problem with my iPad and 740 not being able to update. They'd get a bit of the data then the connection would slow down to nothing and fail. After months of this I finally hooked up a network TAP to my internet line and discovered my Linksys router had IPS enabled and was for some reason thinking the update traffic was an attack and blocking it. This also impacted my GotomyPC connection to work. I disabled the IPS on the router and everything is happy now.