I have the same issues.
I have upgraded from RPI B+ to RPI 4 1GB.
When using the same SD card with LE v9.2, browsing in movie wall works without problems, but when I try browsing on RPI 4, kodi freezes after a few lines. Sometimes it recovers, sometime not and I have to pull the plug.
It is a clean install every time with my advancedsettings/mediasources/passwords/source.xml copied and reboot. Also network connection delay is enabled and set to 60s.
P.S.
After reviewing it is indeed out of memory, at least it said so in crash log:
Code
Jan 25 08:56:54 LibreELEC kernel: Out of memory: Kill process 356 (kodi.bin) score 242 or sacrifice child