Bubbling noise

Hi All,

I received my e-cig about 2 weeks ago and it has begun to make a bubbling noise when I smoke it. What is causing this?

Also, how long does it usually take to charge? i have put it on for the first time today and although it has been charging for around 4 hours the light is still flashing 3 times when I switch it on.

Thanks in advance for any responses :)

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