I am stunned to hear micro USB is rated for that many insertions. The implementation must not live up to the standard. In my experience, anecdotal, I know, microUSB is the most unreliable of all the USB form factors I've experienced. Bad connectors on cables, and ports that regularly fail internally (not levered off the board.) I have considered replacing ports with miniusb, or a tethered B port because micro has been such an utter failure on so many of my devices.