This past weekend I was having problems losing power to my speed control. It happened with 4 different battery packs so isn't likely to be a battery issue. I use 5mm bullet connections (very tight in the batteries) direct to the battery and all solder joints are good. It has worked flawlessly the two seasons prior to this. I lose steering and throttle. Motor temps are 140-145 and the ESC runs 103-108. Tested it out again yesterday (no other vehicles on track) and when it shut down, it made the beeps like it does when you first power it up (think it did that twice back to back but I'm not positive). No lights on the ESC to provide a fault code (I can't recall if the fan was still spinning or not). Turning it off/on restores power and everything works as normal again.
Gen 3 RX8
Gen 3 1900kv