Braids are super limp which just exacerbates any sort of line problem. Wind knots happen when there is either twist in the line or the line is not spooled tightly enough (or a combination). If you spooled up the wrong way your line will be horribly twisted and it will be very obvious. You'll probably have to respool if this is the case. If you see loose loops on your spool then your line is not packed tight enough. When you cast the loose loops are pulled off the spool and viola, instant wind knot. To prevent this from happening always tug on your line after a cast before you reel in so that the line is tight to the spool. Also, try to always reel in with some tension on the line. If you have a lot of slack, squeeze the line between your fingers to keep it taunt. Of course if you spooled all the line on loose then that's a problem. When I spool up with braid I squeeze it very tightly between layers of an old cloth rag.
I hope these tips help.
