Here is something you can try. If you're still having problems and it's less than a year old, return it to your retailer for warranty replacement or call Plantronics at 800-544-4660 x5 x5538 for warranty service.
K100 Speakerphone: How to Perform a System Reset
1) Push and Hold the On/Off button and, without letting go, insert the charger.
2) Let go of the button as soon as you see a steady light on the speakerphone.
3) Unplug the charger.
4) Wait 2 seconds and turn the speakerphone on again.
Good luck from Headsets Direct!
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