After many tests, it is my coaxial cable that does not pass the 5.1 after 3 minutes shocked
This same cable is ok with a stereo signal.


G68ADV + HD621 (dead)
2xBSS 366
LCR Yamaha DSR112
4 Surround Presonus Eris E8
1 JBL 4645C sub and 1 DIY sub with WGTI15 woofer (Crest Audio 8001 amplifier)
3D-Lab Dvd Master/Panasonic BDT700/Panasonic UB420
JVC X7900