I think usually where there's smoke there's fire, so it wouldn't surprise me if Deron is unhappy with how the Jazz have dealt with his friends.
First Dee Brown. While admittedly, Brown is / was a borderline NBA player, he certainly wasn't much, if worse, than some of the other backup PGs the Jazz had on the team, like Palousio and Mr. Fart.
Then they trade Brewer for practically nothing, and don't make an offer to Korver -- his two closest friends on the team.
Then they botch it up with Matthews, and despite what some people say here, I think the verdict is still out on that one, as Raja probably only has two good seasons left in him.
So now we have Jefferson, Bell and Hayward instead of Boozer, Korver, Matthews, and Brewer.
I think the verdict is also still out on Maynor. Yeah, the ownership needed the money, but in the long run, like Matthews, it may come back to haunt us.
I think Deron might be second guessing the FO, and seeing that the ownership sometimes places a higher priority on saving money rather than keeping talent, might want to bolt to a team like Dallas where the owner has deep pockets.