I am trying to figure out why my connection is lost either while loading or 15 -20 minutes into the game.

I noticed this line in the debug log shortly before connection is lost
[09Nov2022 19:52:03.099] [main/DEBUG] [bettercaves/]: UNLOADING WORLD
[09Nov2022 19:52:03.100] [main/INFO] [journeymap/]: Mapping halted in /Users/ggorka/Library/Application Support/minecraft/journeymap/data/mp/ElyseandSashaMinecraftServer_d3773ce2b0f44dcc9ea6bd4aeddbf581/minecraft:overworld
[09Nov2022 19:52:03.123] [JM-task-7/WARN] [journeymap/]: TaskBatch thread interrupted: journeymap.client.task.multi.MapPlayerTask$MapPlayerTaskBatch@35b00a9d
[09Nov2022 19:52:03.124] [main/DEBUG] [frankv.jmi.JMI/]: all overlays removed

What does this mean? Could better caves be causing this? Perhaps Journey map? Any help appreciated, I love the mod.

This is just a message for debugging purposes. Not sure what's causing your issue from the logs given.