I guess that the problem is Wifi 6 (AX). There are some older devices that have issues if Wifi 6 is enabled. If possible and available try to update the device, especially the wifi driver.
However as a workaround you can try to disable Wifi 6 on the IB3. Go to the Menu of the IB3, log in and then go to WLAN/Wifi on the left side. The you will see on the right a check box to disable Wifi 6. Maybe that helps.