reply to snip
Re: Slow internet U-verse 12mbit welcome to interleaving adding 16ms latency and various routing issues.
edit: I remember having a friend with a 3800HG-V and then a 3801HG-V and both times having issues with youtube buffering whereas I never had any issues on my 3600HG-V with most stuff.
As you do not use TV, it may be possible to ask AT&T for a swap. Not sure how that works.