@bicocchifederico did you have any further information? Loads of people here wanting to help you out 
Just have to say i havenāt had this problem at all probably donāt even shake it for 10 seconds maybe 5. Iāve been using 3 scoops to 500ml(water in first), only thing i can think of is have you been adding too much water and not allowing enough room for whats in your shaker to move aroundā¦try adding less water and if you like a thinner texture add more after.
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