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Check the battery. It is not cranking the engine very well when warm. 12.75 is fully charged. Check with the engine running, usually 14.5 max. Check when the battery has been sitting for a while. If it drops below 12.25 there is a problem.

Turn the engine by hand when hot. With a spanner on the end of the crank, It may be getting tight. If not the battery, or a tight engine, then the starter motor is tired.
Also check the battery and starter motor connections.

UK
 

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If its not the charging system, could be a few things: valves, a coil, a crank position sensor can cause that
 
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