flymo smoking?

hello my flymo seems to be smoking when in use, i did cut the grass after it had rained for several days! my hubby is going mad as this is the 2nd one in two yrs after me using a lawn mower.

The grass was a few inch in height could it be that i over worked it or could it be something i need to replace/repair?

your help would be much appreciated

Mrs B
July 2010