string trimmer eats string
My electric (corded) Ryobi 2-line bump-advance string trimmer has recently started eating string! We use it mostly to trim overgrown grass/weeds, not really to "trim." It didn't have this problem in the past, but recently, it won't even last through 20 minutes of use (10 feet of line on each line). I think it started when I got this "professional grade" line (which supposedly lasts longer), but I'm not sure. Any tips on how to trouble-shoot and fix what's wrong?