Lenovo tablet A3000 doesn't charge as it powered on

Hello
Please I have the following strange problem with my A3000 tablet, recently as I try to cahrge the tablet while it is powered on I got the charge mark on the battery for few seconds and then it disappear and the tablet of course doesn't charge. However as I turn off the tablet and connect the charger it start to charge normally without any problem.
Any suggestions?
Thank you,

Try a forced restart(power button+vol up until the phone vibrates).It shoud charge fine.
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien

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Note: Lenovo power manager used to estimate power consumption 60-70W even if W530 in idle state. I thought it's ok, w530 is a powerful machine with 170W AC adapter.
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