^^^^
I'm with Phil - the usual culprit is a loose or poor high resistance connection (the fuse's spade connector springs to mind).
Most times its obvious when you pull the fuse / connection block as you can see the burnt PVC insulation & discoloured copper where the heat started.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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