Why do you tend to think that it could be related to PWMs? Are they running that hot? Keep in mind that some of these digital VRMs are rated up to 100 or 125 degrees C, so even if you're running 80+°C you're still way in the green. What I didn't ask yet, are you load testing with LinX or Prime?
(looked it up, the 2 cooper bussman controllers (the ones with cpl-4-50 written on them) themselfes are rated for 125°C, still searching for volterra ratings)
Edit: Volterras are VT1165SF I believe.
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