Thanks for your quick answer. I can live with the files splitted within 40min files; my problem is that MyTVOnline 2 is not able to read them.
Let me give you more details: every recording more than 40min is splitted (I understand this is normal) / files are readable individually with VLC if I connect the USB stick to a computer (Note: if I try to open the .m3u with VLC, it is not working, nothing happens) / when I go to my recordings, MyTVOnline shows the record, with the full time (e.g. 4 hours) / when I play it (click on it), the player will play the first 40min; after the first 40min, the player stops and never goes to the next file.
I'm open to any solution/workaround.