Hi, my 4x have just stopped switching on 2 days ago. i left them on charge, the light has gone green on the charger. but when i hold down the middle button, nothing happens. I have since tried re charging again, to rule this out, also via a computer USB, still no response from pressing the middle button. When i plug them in o charge, the green ligh is on continuous. Please can you let me know how to proceed, thank you
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