I can now reproduce the crash but it was very very tricky ...
So prepare for a post with much reading and thinking ....
Found a song which causes the crash but playing it standalone does not crash Kodi ...
So what i tested finally (after many many hours) with 3 files in one directory :
1.)
playing song1, chrashsong, song3 -> crashsong (4:38) crashes always at 4:28
playing chrashsong -> nothing chrashes
playing song1, chrashsong -> nothing chrashes
playing chrashsong, song3 -> nothing chrashes
!!! Unbelieveable. thats why i did not find a single song which causes the crash !!!
2.)
Changed song1 and song3 to another song -> same behaviour like above
3.)
I remembered i have crossfade activated between songs with 5s so i deactivated it
playing song1, chrashsong, song3 -> song 3 starts but when i used keyboard to go back also Kodi crashed
4.)
Activated crossfade again but with 10s
playing song1, chrashsong, song3 -> crashsong (4:38) crashes 5s earlier at 4:23 like expected
5.)
crossfade back to 5s
I reencoded crashsong with foobar and lame 3.100 to 190K
playing song1, new encoded chrashsong, song3 -> also chrashed
6.)
Saw that crashsong had 48 KHz and the rest 44.1 KHz
Now reencoded the crashsong with ffmpeg to 44.1 KHz
!!! Yeah, now these 3 songs are runnning without crash ... !!!
So i will reencode all 48 KHz songs to 44.1 KHz and then test all songs again.
Hopefully this was the root cause for all the crashes
There have been approx 30 songs with 48 KHz in my list of about 1000 (most of them converted online out of youtube videos ...)
But a 48 KHz mp3 should not be a problem for Kodi, or ?
Finally my about 1000 songs played now for about 20 hours without crash ...
So my already new bought hardware T730 is no more needed ....
Shall i provide these 3 songs and if yes how ?
Best regards
Joe