So it was the tire's fault. Those 2 metal wires were cutting all tubes.
I would start my ride with fully inflated tires (80 PSI) and would get a flat in first 5 miles. I would replace the tube and would finish 20 miles ride.
So why wires would not cut a tube during 15 miles ride? Lower pressure? I do not have a gage with me when I ride, so I would pump be a eye.