Make sure that the oil channel is not blocked. Clean if it is necessary.
Examine if there are burrs on the edges of the guide bar. Remove the burrs using a file.
Clean the groove in the guide bar.
Examine the groove in the guide bar for wear. Replace the guide bar if it is necessary.
Examine if the guide bar tip is rough or very worn.
Make sure that the bar tip sprocket turns freely and that the lubricating hole in the bar tip sprocket is not blocked. Clean and lubricate if it is necessary.
Turn the guide bar daily to extend its life cycle.