Thanks bbunge. I had pretty much been using the default values.. Am giving the ones you suggested a try. Will see how they work.
@degrub. Had been using WPA2 on the IoT VLAN, but thanks.
It is a bit hard to say the exact time the devices dropped their connection, but judging from the gap in one of the device's data graph, it happened around 4:45AM.
Took a look at the log. Unfortunately it starts ~7AM so can't see anything around the 4:45 time. Bunch of log entries in the middle...
Recently bought and setup an AX86U Pro router at my home. It is fed from a DSL modem, so not running at very high end speeds. I am fairly new at this, but it seemed fairly straightforward. The main 5G and 2.4G bands seems to be working normally. I also created a couple "guest" VLANs, one of...