My mgm224/18 controller is behaving strangely lately!!!

[michael kang]

My mgm224/18 controller is behaving strangely lately. I set it on one-directional car mode with second to hardest brake setting. I'm running e-revo with NEU1515/1Y motor on 6S lipol (25.2V). It has worked perfectly so far (except for heat issue (temperature at about 160 degree F while motor is at 140 degree F)). But, recently, it behaves strangely when I apply full brake. This doesn't happen all the time but I'm still worried... it just started last weekends like couple of times for 100 times braking.

Okay, here it goes. When I apply full brake, it stops. To make sure it comes to a complete stop, I applied full brake again, and all of a sudden, it went backwards at full force doing backwards backflipping. And like I said, I set my car to be unidirectional (reverse going is not allowed~!!!). After that incident, I carefully drove the car again and it seems to be working fine....

This is certainly not normal, is it? I asked Grisa from MGM if it's ok and their recommendation was that since motor works as generator during braking, Voltage may go up as high as 40 V and that if I want to apply hard braking on 6S running I might as well buy controller that can handle upto 8s lipo voltage(which I think is ridiculous since if such being the case, they shouldn't have advertized that it can handle 6S lipo). Another alternative suggestion from MGM was to use soft braking which I might try afterwards...

Like I said, esc seems to be still functional but I'm still worried that this might happen again and hurt my kid or even explode!! Any advice?