I have a couple of newer RedMax trimmers with the "latest" style heads. The kind with square rings where the line exits the head. Is it just me or does anyone else have trouble with string binding up inside these heads? Sometimes it gets so tight in there, it looks like the string has almost melted together. I have noticed (out of frustration) that if I really slap it down hard on the ground it will release some string at times. But this is so hard, I know I'm just asking for problems if I continue to beat it this way.