video on 6151

Hello.
I own a Nokia 6151; when I take videos, I cannot get them longer than 6min
13 secs, even if I set the max length of the video to "maximum", and even if
the memory of the phone is not full.
So I have to take a video of 6.13 min; then it stops; start again another of
6.13, etc.
Is there any way to take video whom lengh is really limited only by the
memory left?

Cheers

Filippo