Do not leave your cable with no slack, you'll burn up the plates from constant slight slippage. Check out your basket and hub for notching/grooving as mentioned. Sometimes plates will also stick together from sitting (causing your stated symptoms.) Hit each side of the friction plates with an ultra-lite sandpaper to remove a slight glaze, check metal plates for overheating/warpage/discoloring (no cable slack will contribute to overheating/fast wear), change oil.