Weird definitely, nothing external and it didn't happen instantaneously but slowly over a 3 day period. Once it died it was completely dead, no castle link, nothing. When I ran it I didn't do anything extreme just circles, straight runs etc my motor was a Medusa 36-60-2000, and I also slapped in a Fiego 9xl to make sure the motor wasn't causing any problems. Both motors work perfectly with my MM.

I don't think these few failures should be the cause of worry, they are all different and I'm 95% confident that when I get my replacement it will be good, there will always be some failures!