@BrianG61UK The Raspberry Pi Zero W has a really old low power b/g/n class chipset and from experience found this doesn't like 40mhz wide channels Try setting the width on the 2,4ghz to 20mhz with N...

@PhungDung Hey I noticed you are running controller v3.2 did you try running SDN controller version 4.2.8? Personally I would recommend you run v4.2.8 and not v3.2 Download here...

@WilcoV This does seen strange. Are the 2x APs close enough that their signal could overlap? Im thinking that each time the controller does a review (10 secs) it determines the other AP has a signal...

@Danmed IF you forget a device it should factory reset and go back to default. Personally however I usually just press the reset button anyways to be 100% sure :)

@SophieMay That is a very strange one indeed, usually the 5ghz doesnt give any issues Try changing the channel to 44 or 40 and set the width back to AUTO. This will force it to reconfigure, then...

@XC90 That would be helpful yes, totally agree!