no. a phone that randomly shuts down would cause the user to buy a new phone.
Except they never ‘randomly’ shut down. They shut down when there was a HEAVY demand on the battery which couldn’t deliver.
My iPhone 6S did this to me before the update once or twice - the battery was old, the weather was very cold. The iPhone clearly couldn’t handle the task I requested and just shut off. I booted to see the battery was fine and everything was OK. Tried the same App again -> shut off.
I simply *assumed* there was a fundamental problem with the hardware and was due to replace it when Apple came out with a fix & (belated) explanation. The iPhone 6S worked fine for me for a further year until I sold it... and the owner of it STILL has it working today, albeit with a degraded battery (but no shutdowns).
People... SMH...