Roger young

I have a 10527STE snow blower and at the end of last season and at the beginning of this season I started to have a problem disengaging (in other words stopping) the snow blower from moving forward even after releasing spring lever on the handle. Husqvarna snow blowers have a spring lever on the left handle which must be depressed in order to move forward/or backward. The right handle has the same type of lever however it is used to engage the auger in the blower. If the handles are released the unit is supposed to stop moving and the auger is supposed to stop. In my case the auger stops however the unit does not stop moving forward. Currently this condition seams to occur after the unit is fully warmed up. This is intermittent. Has anyone had this problem? Any suggestions? I just inspected everything and it looks OK. Thx