Hello,
Good news : I have an operational system - without the remote.
New configuration :
* 3 A / 5V power supply
* MediaPro III directly connected to the Raspberry
* Wifi dongle for Rii keyboard
* External hard drive with power supply
* Ethernet connexion
* Osmc version of November 2015
* Tvheadend
* without and with overcloking in "Turbo" mode defined in Osmc
* cpu working in "performance" mode
Evaluation after 48 hours and some records scheduled :
* even the problematic HD channel is accessible without freeze
* I can change of channel without freeze
* the update of EPG data is done
To be complete, I must test the later configuration : Openelec + VDR but with the 3 A power supply. I suppose that there is two possible origins : a faulty power supply or a bug in VDR or it's configuration.
I'll come back later to give the results of this tests.
Thanks for the support and the different advices.
I've updated the Raspberrypi.org forum.
Now, if I want finish my multimedia center, It would be perfect to have the remote command to control it
I reactive my other thread.