Ask HN: Problems of de-motivation.. after a while

I always seek new challenges. I have found few organizations, established or new alike - are able to offer me the tech challenges I need to survive in this industry. Without challenging problems and with petty office politics, I tend to become numb in an organization - usually within a few months of joining. Then it becomes a slog, and I don't want to lie like a mundane and just-another employee who is going through the same motions.

I don't know if there's a solution..:(