Kamali,
I see that you are in the same area as I am. Try to buy the milk brand Cream-O-Land. Whole milk (4%. Red). I found that they are the most consistent in the ability to produce microfoam. Other brands, no so much, and gave me problems.
Try to stretch the milk as quickly as you can, so that you have as much time as possible left for the texturizing of the milk.
Try to create a whirlpool or standing wave that will texturize the milk right from the start as you stretch.
Then go a little deeper to continue with the texturizing. So basically, step 1: stretching/texturizing. Step 2: texturizing.
Your foam separates from the milk because your texturizing does not work. Try not to create only a spinning whirlpool, but also a standing wave that rotates the milk from the bottom to the top. This way the whole depth of the milk will homogenize, not only the top. You do that by positioning the wand in that perfect spot that you need to find. Try with a glass of water so you see whats going on in there with your wand tip and the turbulence it creates at different spots.




