I was offered the new firmware, yes, but on the understanding it fixed the issue, not to try out something they could easily test first by themselves. The new update seems to have caused further problems. I don't see any benefit of either the LG-RDK_7.6.15-2306.5, or attempted fix version LG-RDK_8.10.9-2309.3. Until a proper fix is found, anyone who complains should be able to have the firmware rolled back to the previous version to LG-RDK_7.6.15-2306.5 (I don't know what that is specifically). It's clearly possible to have different hubs on different versions, based on the hub MAC address, which is how the latest version was applied to those offered the new version.
I'm not willing to purchase yet another 2.5G switch to work around this (managed vs unmanaged) as big-luap did. I only bought the 2.5G switch I currently have to take advantage of the faster speed, since I already had a 1G switch working perfectly fine before that.