netHOST: "Invalid task handle" message in Extended Diagnosis after a new FW download has been performed.

"Invalid task handle" message appears for Extended Diagnosis after a new FW download has been performed by the netHOST DTM. This is due to the fact that task handles are fetched only once, on the first "Connect" performed on the DTM. After FW download task handles by FW side are recreated, hence different, but the DTM still tries to use the old ones.