What are the most vunerable parts of the motherboard relating to heat ?

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The CPU chip was running at 20+80=3D100C it is now running at

55+80=3D135C. This may be the failure.

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Long term high temperature makes the Lithium go bad.

Yes but it costs either money or performance. High temperature components are usually more expensive.

You can cut the power in the CPU by dropping its clock rate in half.

You can use parts that are over rated for the application and add heat pipes etc.

Most PC mother boards are intended to be suspended in the air. If you instead made the PCB such that in mounted pressed down onto an aluminum heat sink and had fluorinert pumped over its top surface, you could greatly reduce the operating temperature rise.

55 degrees was the temperature of the motherboard.. outside it was at most 25.5 degrees celcius or so.

Bye, Skybuck.

That's running on the high side. Perhaps you need to ventillate your case better. I cut the fan grill out on the rear of the chassis which increases air flow dramatically. Those perforated grills are horrible.