I have a stihl f36z weedeater. It is a bit of an older model but still works fine and true till this day. The weedeater will crank and work just fine but once it runs for several minutes and is turned off it cannot be cranked again unless it sits for about roughly 30 minutes. Afterwards the weedeater will crank and work again flawlessly until it is turned off or runs out of gas. On a side note when I try to crank it after it is turned off the crank string/cable seems to be slippery as if it is not getting enough traction. Any idea what could be causing this?