I only had one problem and it was caused by me calibrating the compass on a sidewalk. The metal in the sidewalk caused a bad calibration, but I landed it without damage.
I'm having issues with my iPhone 6c plus it loses video signal starting about 30' away and then breaks down so bad I have to do line of sight flying with no video signal.
If I was planning to fly for money, I would instead tell them I would do the job for free, but I would have to charge $100.00 for computer services to burn them a CD.