WAX220 firmware 1.0.3.5 apple instability

When I first bought my wax220 I had trouble with iPhones and iPads staying connected to 2.4g WiFi. Netgear produced firmware 1.0.3.4 and that solved the issue thankfully. I had no issues since. 

Yesterday I tried upgrading to firmware 1.0.3.5 and again my iPad had issues connecting. I could see in setting that the WiFi was constantly connecting disconnecting and reconnecting 

I downgraded the firmware and the issue was resolved. 

other devices such as Amazon fire tv seemed to connect ok but I didn’t stay on the new firmware for that long to really test

ive seen other people complaining that 1.0.3.5 exhibits stability issues with apple devices 

any advice about this? Why hasn’t a new firmware been created? 

thanks