Dennis had also complained about the rack on his previous break, and the TD got a new one - or at least he took it off screen and then came back.
I'd like to know actually "what" his complaint was? What was the rack doing for SVB, that it wasn't doing for him?
I've watched a few videos of him playing when he didn't seem to be in such chipper mood when he was losing. That is an attitude that is easily recognizable and some people let it affect their play more than others.
He is usually winning so you don't see it as often as you maybe do in other players.