After a few days of reading on the internet (I dont know any thing about linux)
And after several reinstals, I found out the problems.
1: I have 2 routers on one network switch,disconnected one router,and the problem of player not found was gone.
2: The main problem after update or reinstall was ,,NO SOUND,,
After a lot of reading i installed PUTTY,to SSH M2P.
Gave the command ,,alsamixer,, then F6 to sellect USB audio.
I had to UNMUTE the USB audio with the ,,m,, on the keybord!!!
I HAVE SOUND ,
To be sure,I reinstaled M2P on other SSD carts,all work after UNMUTING in SSH.
I instaled the U3 and did all the instal things rebooted at every change ,stil no sound.
Debug: Server ,, player error (146) unable to get players ,,
Selected several other USB players,saved and rebooted, but no sound
updated squeezelite,no sound
Hw USB2.0 High speed true HD Audio without any conversion Card Audio -1 DEV=0
But for testing it again ,i first have to reinstall because i installed dietpi on the Odroid C1+ of my first streamer.
I have 2 streamers,one is stil working with M2P on an Odroid U3,i havent updated that one yet.
I wil replace the streamer with the C1+ for a U3 with a fresh installed M2P and test it again
On web, I see that Logitech server plays the selected song,volume is at 100%,but no sound.
Max2Play free download