When using the chainsaw the chain stops running it appears as if the clutch is slipping and only starts again when I restart the chainsaw

too much load (too large a cut), dull chain, no lubrication oil on chain, slipping clutch.. lots of reasons.. need more information and you need to check all the points I mentioned. The clutch is RPM dependant- once the RPM drops- the clutch will start to slip. Look for oil or grease on clutch shoes also

the starting clutch is slipping , this is not to be confused with the chain clutch (other side) reasons a start clutch slips , dirt inside /broken friction surface

Seems like it could be a clutch/drum issue. I have known clutches to break through the threads in the crank shaft so they appear tight but are actually broken. I'd look at the drum assembly to see why the drive to the chain is slipping.

If the saw was run with the brake on, or with the brake cover pushed on with the brake on, then there could be some damage to the drum, the clutch, or the pump drive gear that is normally driven by the drum, the lack of oil to the chain could be the same issue as the noise, remove the brake, clutch and drum, inspect all of these components for damage or blueing from heat, if you can pull the clutch shoes out with your hands then the spring requires replacement, check the needle bearing for the drum, if this is dry, then re grease it, check the oil pump drive gear for melting or damage.

no expert..but sounds like the centrifacal clutch went out

The problem you have isnt adequately explained.

1. You may be tripping a thermal overload.
2. The chain may be to agressive and overpower the motor.
3. The chain may be excessively tight, that combined with the load may be the cause.
4. Limbs as the cut progresses, pinch the bar and chain.
5. No bar oil or defective oiler.
6. If equipped with a clutch it may be slipping.

There are other causal factors too. Read your manual, limbs require 2 cuts, the first from the bottom ↑ about ½ way through, then offset a couple of inches toward the trunk from the top ↓. HTH
Lou

THE SAW IS RUNNING FINE . WHEN THE CHAIN STOPS AND THE ENGINE IS STILL RUNNING AT HI THROTTLE THE CLUTCH MAY BE WORN AND SLIPPING. PULL THE CHAIN AND BAR AND SEE IF THE CLUTCH HOUSING IS BLUEISH IN COLOR IF SO I WOULD REPLACE THE CLUTCH

Make sure the saw is pumping oil to the bar and chain and that the chain turns by hand freely. If ok, is there a sheared or missing key between the clutch center hub and the crankshaft?

Try washing out the clutch interior with carburetor cleaner from an auto parts supplier and blow out with compressed air.

Sounds like th clutch brake is engaged. Try Pushing firmly foward on the hand guard in front of the handle. It should click to release the clutch brake.
Let me know if this helps.