I have been riding one bike (2007 trek soho 1.0) for around 3 years and about 3500 miles a year since december of 2007. On this bike I have broken 4 spokes and repaired them all to perfect true. I also am riding a $350 workhorse I just got last christmas. I have broken 4 spokes on this bike in the last 3 months. This bike had 2 spokes break and then I had it trued to perfect and I broke a spoke not even 10 miles after retruing this wheel. I am super frustrated as I've never had this kind of luck with bikes ever.
I weigh 188 lbs at 8% BF so losing weight isn't much of an option. Is this the main factor, or is there something else at play? I don't ride hard and on bumps I make sure I let as much pressure off of the bike as possible. When commuting I carry in-between 10 and 40 lbs. Any suggestions? I am extremely frustrated with my problem as it is my main form of transportation (I don't own a car).