I recently aquired this very nice Kitchen Aid dryer that works great EXCEPT that it seems s l o w at drying. Whether on automatic or timed dry with HIGH heat selected, every load has to be dried a second time. Today I dried a load of towels, set timed dry at 70 minutes. When done, load was still damp. Dried another 20 minutes, still not dry. Set it for 20 more minutes and clothes were finally dry. I do realize that part of this 20 minutes is cool down with no heat. All the felt and seals seem fine. All airways have been taken apart and cleaned, no obstructions. This dryer is not permanently installed, therefore there is no vent to be clogged. Is this normal for this dryer or ???