Hi I gave up using it. This is what happens:
The suction power can only last 5 min. Then the weird noise comes and there is no more suction.
So I had to open it, take out the dust bag, rinse off the dust, wait for it dry (1day), put back again, then the suction resumes. 5 min later, the cycle repeats.
Definitely not a good product and will give a honest review about it.