Only happens after a warm up?
And will restart after a cool down?
Identify the ignition systems boxes ... and wait for the failure to happen .. then cool each box in turn using water .. if none of the boxes is causing it then magneto.
If magneto is the suspect them measure it (resistance - ohms) clod ... then once the fault occurs .. you are looking for a large change .. not just 20%. A large change will tell you that it is the magneto.
If it is one of the boxes .. check if it has a 'heat sink' (bit of finned metal) attached to it .. check that it is still bolted up? If that is ok .. then there is a heat transfer paste between the box and the heat sink .. that can dry out and may need replacement.
Good Luck.
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