[sclangdon]

Are you sure you're burned out? It sounds to me like you just don't like working with your team lead, and he, apparently, doesn't like you too much, either.

Sometimes people feel threatened. Maybe you're getting a lot of praise from the founders that you're not aware of but the team lead is. Maybe your team lead resents that you fixed X and feels his own position is in danager so he's driving you out?

You say you won't go to the founders because you can't see how they could resolve it, but you don't seems to consider that if you really did single-handedly solve X, then the founders might move the team lead on rather than risk losing you. Founders aren't stupid, they know who the value players are. They might be well aware of what's going on, but not to the extent that they risk losing you. If they are made aware of such a thing, you might find things change for the better.

In short, the problem is the team lead, and if the founders are made aware of it, things might change. If they don't, find another job.