Ok, so your issue is not related to the 2.4 or 5G signal, based on your description, it looks like your Switch (ICX7150 Switch) may be booting from the wrong partition, let me add the guide to fix the issue.
Note: if you have access to the Unleashed Dashboard and the Switch can be seen from there, it may look like the following image, ICX7150-C12-Router instead of ICX7150-C12-Switch, now before starting the steps of the guide, I will advise you to cable the computer directly to the Switch, since you will have a better connectivity than if you connect via wireless.
How to Fix Routing code issues on Lennar Home users via Web GUI.
How to Fix Routing code issues on Lennar Home users via CLI
Note: after fixing the issue of the Switch booting from the wrong partition, please perform an upgrade to the code 08095g UFI and upgrade both partitions with the switching code file named SPS08095gufi.bin, so perform the software recovery using the code 08090k with the upgrade image file named SPS08090k.bin, then when the switch is back to normal upgrade to the file SPS08095gufi.bin in both partitions primary and secondary.
How to Upgrade a Switch ICX-7150-C12P using a USB flash drive
How to upgrade a Switch ICX7150-C12P via TFTP
Technical Support Engineer | L2 TAC Wired | Lennar Home Community