Ok Bilgus, I installed the CLIPZIP_CVDDP2_10-27-17_rockbox-full. Now the player works fine, don't freezes anymore.
I'm curious about the CPU parameters. In debug mode, when I clic on frequency menu I see for an istant the values: freq.192.0 - voltage 1.1 and immediatly they changes in frequency 38.4 - voltage 0.8.
What does it mean?