EZ Run 80 Meltdown

[vtxnitro]

Hi
Just thought I would share this story cause I have a couple questions. I just convereted my revo 3.3 to brushless using the rc monster mount, techno battery tray and straps, Hobbywing EZ Run 80 A controller, Fiego 9xl motor with heatsink and fan, 2 2cell lipos wire wired in series and a 17t pinion. I ran this setup and it was awsome the truck ran great until I stripped a spur gear Motor temped at like 145 F and the speedo was at like 100 F. Fast forward about 5 days I get the new spur gear and reset the gear mesh maybe just a tad tighter thatn last time but it does not feel tight at all. I put the truck down it goes about 100 feet then starts kinda jerking by the time I get the the truck it looks like someone put a red smoke bomb under the body, then the smoke quits and I can see the controller under the body on fire pretty good it at this time is melting the lexan body so i pull the pins and rip the body off and flick the flaming speedo off the truck and into the grass with a screw driver in and effort to salvage the truck and prevent a major lipo fire. End result truck is not bad, speedo is all but unrecognizable, one lipo pack is not gonna make it ( it never puffed or anything but a corner got melted prety good but not enough to get throught the foil cell packing or cause it to vent infact cells still held voltage fine just not gonna risk it), lexan body totaled. I got off pretty lucky I think, but my question is this. Is this somethig I did or did the chinese controler just self destruct. I did not change anything on the controller setting except to set it to manual voltage cut off at 3.4 volts per cell. Punch was set on 5 and timing at 15 just like stock.