Replacement cables failing?

i've noticed starting ipods , continuing first iphone. keep spare cable @ work, in car, , @ home keep chargers. use generics make sure have enough. in time these cables seem fail. first them , device charges charm moment connect. in time cables little wonky phone stop charging when cable jiggles. in time, they'll stop connecting entirely.

check end, no dust. phone isn't issue because works fine other cables. seems problem isolated part. strange.

 

generic cables on map quality wise.

 

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