ghtester please always post "pastekodi" and/or kodi crash logs if you run into issues - as mentioned in the sticky in this forum - otherwise we have no idea what's going on.
RPi4 has a known issue of the OOM killer kicking in which will be resolved by switching to a 64bit kernel - see here RPi4: switch to 64bit kernel by HiassofT · Pull Request #5507 · LibreELEC/LibreELEC.tv · GitHub - if you had provided a "pastekodi" log I would know if it's the same issue or a different one.
so long,
Hias