BF 109/110G canopy/window rattle

[Lolrawr]

Hi, I`ve noticed that all 109 and 110 G have their canopy rattle, rattle that intensifies with throttle. If i look at the canopy i can see the window vibrating and its either the left or right side, never both. 

Is this normal or am i doing something wrong? Also there are rare times when this does not happen, it bugs me so much, i hate that constant noise. Iirc this didn`t happen (or noticed it) a few years ago.