I had to recraft it, at least I could salvage some of it with the table, but I've lost the most annoying stuff that I had to recraft, the HV capacitors in my chest and legs and some components, at least I saved some, I have no idea how that could have happened, I have the cooling system, its on all the time and I also have some heatsink layers on all my piece of armor... Just for testing purpose before trashing the armor once it was empty, I tried to touch it and got the same problem, will check in the config if I could disable that overheating, I was just exploring a Mystcraft age in a Fire Swamp and got this problem...
I go in the Nether regularly with that same armor and I never had problems there...