IPohne 4 gets very hot

my iphone 4 8GB (iOS5.0.1) is know 2 weeks old and i noted: it gets very hot if i recording a video or charging it.
shortly after i recorded a video i couldn't hear anything out of the speaker and couldn't change the volume.
after i have waited 15 minutes , all works normaly
it doesn't feel good in my hands..too hot!...i don't think it's normal..
i found some accidents in the internet about iphone 4 that they burned itself.
i don't want make the experience, that my iPhone will burning,too.
greetings from Germany
Marco H.

Try a totally fresh iOS install. When prompted at the end as to restoring from backup or set up as new phone, choose New Phone.
http://support.apple.com/kb/HT1414
If the problem remains after doing that, it's a hardware issue.

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