Nexus 4 getting very hot in convergence mod

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Hello everybody,

First of all i would to thanks you for the great job achieved on ubuntu touch !
I've currently experimenting convergence mode on my nexus 4, really impressed.

the only drawback is the temperature of my phone while running in convergence.

With the browser and the terminal open, i can still hold the phone in my hand, but it's very warm. After 5 min of youtube video the phone gets so hot that i cannot anymore touch it.

I guess this temperature are not expected in this functionnment.

my phone :

phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 350
device name: mako
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2016-07-05 06:40:01
version version: 350
version ubuntu: 20160705
version device: 20160401.1
version custom: 20160701-5-vivid

i've upload a random top
What is runing is with cpu >15% : QMLscene, unity8, oxide-renderer and webbrowser.

Is there a way to know the internal temperature of my phone ?
What are the other way to discriminate a normal behavior / bug / hardware issue ?

Thanks,

Regards