After a longer usage, my wheel stuck on the wheelbase. I cannot remove easly.
I must give it a stronger hint from below to loosen.
Is this the normal way? I think it’s not good for motor axis to get a hit on every wheelchange?
It is normal for the wheel to get a bit stuck. A small knock will usually be enough to loosen it.
I would suggest to turn the wheel upside down so you always knock it downwards. That way the QR parts don’t hit any sensitive parts such as your display.
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Just be careful about the other sensitive parts below the wheel. 
Greetings from Shanghai, Mika!
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and you might also want to put just a little bit (!) of grease.