Fun fact, it was so hot yesterday that the motor on my ebike overheated while I was cycling home... up a hill. So, yeah, yesterday, I inadvertently learnt about "limp mode".
For your bike to suddenly throttle halfway up a hill is both disconcerting and exhausting.
Thankfully, the motor is working fine this morning, but lesson learnt; my bike is now parked in my air-conditioned lab.