Do not feel as though you are alone. I got a Quark and it had issues, so I sent it to S&T and got a new one. When I pulled the new one out of the bag, one of the motor leads fell off. That was encouraging. I soldered that back on and wired up my Quark. It runs for about three minutes before shutting down with the yellow light blinking. The case is reading 98*F.
I got Frank at Quark on the phone and told him what was going on and that the unit I got was already a replacement for a defective unit. It really sounded like he didn't even want to deal with it. He just told me to fax a copy of my receipt to them and they would give me a refund. What's up with that? The problem is that I don't know where my receipt is; besides, I don't want my money back, I want an esc that works.
I suppose I'll have to do the "mod" and hope that's the problem. As is stands now, my modded MM is head and shoulders above the Quark.
It sucks that smoothest ESC and must have for Neu has serious thermal issues in bigger trucks. they they call it Monster Pro when it has issues in Monster Trucks.
Oh well after the mod it seems to work.
Radek
V4 D8 - RX8, XERUN 4168SD
F1-09 - Tekin RS Pro, 17.5t Redline, 2S LiPo
Sakura Zero S - LRP, Saturn 20T, 2S LiPo
*EX-10 Eurus*