2 pairs soles come loose

I will never, ever buy Nike shoes again. My second pair of blue running shoes just open up, sole comes loose, how do you pay so much for a nike shoe, end the soles just come off. I thought it was only the first one, but lo and behold I bought another blue pair, end the same thing happened, not even 2 years old. My Nike trainers are 6 years old, no problem, but boy don't ever buy the blue ones!!!!!