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That has been posted on other threads, it seems that if the phone gets hot its a way to protect the screen.
It happens with all phones of all makes - It's called throttling to protect itself and also one thread is enough
It will happen, also if you watch too many videos or multitasking and the phone gets hot, it will occur.
Thommo has already answered that question
It does occur - or it's already been throttled and won't operate at it's full potential