Thank you for your answer. I play on iphone8 64gb, so I have more than 2gb free. Also, cookies or cashe are not relevant, because this isn't a computer ... I have now more then 2800 sugar drops .... So, I understand that I must have patience, and wait until they fix the glitch.
I'm also not receiving the prizes for the sugar drops. I have now 2230/60 !!! (I'm still getting many sugar drops in level 3942). Do somebody know when they fix the bug ?