If one of the lines on the rotary arm becomes jammed, this could result in the line not closing or opening properly, or even sagging.
If the lines are jammed, carefully remove the caps on the rotary arms and straighten the jammed lines again. You're welcome to email our Consumer Service (info@leifheit.com, Subject "Jammed line") or call on 0800 5 34 34 34 to request illustrated instructions.