"Leon" wrote in message
...

Because it works fine for a while I'm thinking that the blade is
stretching as it warms up. Perhaps adding a bit more blade tension after
cutting for a while, to compensate for the stretching, would help.

John

Agreed with the stretching/expanding with heat. Once it expands the
tracking will change. Try letting it cool and see of the blade returns to
normal.

Yes, expanding is probably the better word here...

John