Nestle whats happening to your nesquick?

i made a beer mug of nestle i just bought which cost me R90 from pick n pay park meadows and i used a decent amount of a tables**** heaped for the size of my beer mug. It has been 30 something years since i had banana flavoured nesquick and it was ruined because the rice flour or whatever you used in it didnt disolved and it all clumped at the bottom of the glass.. im really disapointed