Why Do I Keep Running Out of Hot Water?

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I own a 2-story house with a hot water recirculation line.  Two of the faucets consistently run out of hot water.  I changed the internals in one of the faucets, to no avail. The faulty faucets will supply hot water at times, and then a flow slightly warmer, then cold, then a little hot again.  I tried shutting off the pump for a few days, also to no effect.  To replace the pump would be a problem, and I'm not dying to do it considering the remaining 5-6 faucets work fine.  Any suggestions?

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