As described on LibreELEC (Leia) 9.2 Beta 2 i did more tests to reproduce.
Installed on clean sd card , enabled ssh and copied via samba share several test jpg files.
When entering pictures viewer kodi just freeze for 2-4 minutes , some times on start sometimes after few picture viewing and using left/right to switch and then usually kodi resumes or crash and restarted.
Also when new file arrived and libreelec picks it up for library scan , there is a freeze from time to time , My guess its the same problem as in the picture viewer
I think there is a problem with certain jpg types , because with my old jpg files i never managed to reproduce the freeze.
each problematic jpg files i about 5-7 mb , i cant upload them here , if the logs are not enough i will upload them somewhere.
Thanks in advance for any help.