Heat does indeed kill electronic devices and many other things as well
However I do not believe that it was just the heat that killed the Paramode Conveter - Cheap as in junk Chineese input side 1,200ufd @200Vdc 85C caps that were not constructed properly were the cause. A known issue for many years which continues to show up on all sorts of electronic devices. Either way yes excessive heat kills - they should have installed at least 105C caps in there in the first place.
Keep your Iota away from excessive heat if at all possible it will die an early death if stressed too much
PS - The Paramode is currently doing daily duty keeping two 6Vdc CG trolling motor batteries topped up and ready to go