My guess is your build periods are too aggressive. You are increasing something, i.e. mileage or intensity by too much during that period. I would not change the number of weeks in the build, but I would tone down the build a bit.
Something that a lot of people do not take into consideration when training is even in build phases rest is imperative. And, the other thing that people do not take into account is the stress, physical or mental, in their daily lives. You are training your body, and what you are doing is repetitive stresses, building of stress level, with appropriate rest in between that builds the muscles, heart lungs to be able to do a harder workout the next time. Outside stresses (other than cycling/workout stresses) should be taken into account when you are doing a build. If you are particularly stressed outside your workout, then you need more time to recover, or you need to decrease the intended workload to compensate.
Hope I explained this well enough?



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