No problem with mine.
Even after an hour's drive where the phone has been on charge the whole time it's still just warm.
And, my phone is connected to Android Auto Google Maps, my Garmin DS61 Satnav for traffic and is running Speedtrap Alert for speed cameras so it's doing some work.
The only time I experienced a very hot phone was a HTC One M7 I had when I tried using it as a SatNav displaying Google Maps on the phone screen.