But OP said he did adjustments on the cable. I assumed he knew how to do this. If somebody hadn't done this, yes, cable tightening can be the issue. That or the stop screw.

BTW, I was having trouble on a bike after ca. 300 mi, I thought it was a cable/stop issue. It was a crap-design crank. I'm not that strong, but the crank loosened (and did it again afterLBS repair), and I had spindle free-play. I never saw that before, but you learn somethin new the longer you ride. I may demand a new crank. I can reset it, it's been the LBS doing it once and me twice in maybe 600 mi, but I shouldn't have to do this. It's an FSA crank.