Happened to me twice with an iPhone. Both times I triggered it when the phone was lagging for some reason (eg it got too hot and throttled down). I guess iOS do

Happened to me twice with an iPhone. Both times I triggered it when the phone was lagging for some reason (eg it got too hot and throttled down). I guess iOS doesn't track the delay between button presses properly when it's overloaded. I was able to cancel the call in time, but it's a horrifying seeing the timer go down while mashing the non-responsive stop button.