When a specific spot on a fascia or sofit fails and the rest of the fascia is good, look for external problems. We had paint company representatives go to a job site to determine why the paint was failing in an area. Upon further investigation by the representative, fall leaves and twigs were found plugging the down spout. It is possible that the water couldn't get down the drain spout. If water had frozen in the top of spout, it couldn't drain. The only place the water could go was under the wood of the fascia or soffit. There might be other reasons, but this is one possible explanation why the paint failed.
Any problem of failing paint on one specific area could also apply to other areas of failing paint. We have seen paint fail and blister on window seals.
Sometimes the problem is water seeping, or it might be the direction the home is facing in the summer.