The motor I killed was the same age.
Some ESC's are capable of supporting Sensored, I was lucky.
Been perfect since.
and I was the same, 1 turned into 16. (Red Jeep)
Have something for any situation now.
There is another perfectly OK posibility, Flat battery. They go slow, stop and then fast as some charge returns, repeat cycle till battery is dead.
This means stop recharge and play again. :oops: