Purchased a new pair of X4's three weeks ago. No issues while running and working out, but they've all the sudden become unresponsive. They said fully charged, then instantly went to 80%, and finally turned off after 10 more minutes. They have not been responsive to any charging or factory resets since then. I've only used my laptop USB charger as I learned any other power source can void the warranty on my X3's.
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