Anyone else have problems with the chargers for iPhone 5c?

Within the past 6 months I have had to purchase 4 chargers for my iPhone (5c). They either erode at the top where the wires are then exposed, or have just stopped working/charging with an error of "This may not be supported on this device". Has anyone else experienced this? Found a solution? I'm getting pretty frustrated and tired of paying for these.
I don't "yank" the charger free, pull on it- I've made it a point to grasp the top to unhook it… Anyone else?

Added (1). They have all been purchased at the Apple store- except one, one at AT&T…

Are these chargers are Iphone Authentic? As it have 4pcs you used, i suggests you would take them to Apple Store to check. Hope your problem can be resolved as soon as possible.

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