sounds to me like you you have probably got some kind of puncture cauing debris or defect in the tire or wheel. No one gets flats that often enless they are riding over known bad terrain. First, look at the rim tape. If the spokes or nipples are protruding through the tape, you will definitely have problems. Second, make sure you check the inside of the tire for a protruding obect which keeps repuncturing the tire. Finally, if the tire crcass has a defect that isn't readily visible, you can find it by ensuring that you always mout the tire with exactly the same orientation. If you keep getting a puncture in the same spot, the tire is your problem and should be replaced. Just line one of the tire labels up with the valve stem in the exact same way every time you put the tire back on the rim. If you kep puncturing tubes in the exact same spot, relative to the stem, you've found your problem.