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Hot water loop

Hi, I have a hot water loop coming off my steam boiler that is used for the downstairs heat, it's on a seperate thermostat. I bled the hot water zone and everything worked fine for a few days. One day i got home from work and the steam was pumping but my thermostat was on 64. I have since figured out that every few days to a week the downstairs zone stops working and if my tenant turns his thermostat up to  70 the steam pumps up stairs until the downstairs thermostat is satisfied. When the down stairs zone works everything is fine. Why do I have to keep bleeding my hot water loop so often? I have a TACO 007 circ pump fyi. Thanks in advance
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