@Zorro16 

Hi,

When you setup the AX73 to replace the MR600 did you configure its network settings to be that same?

For example, if the MR600's LAN network was configured at its default 192.168.1.1, then it is advisable to also set the AX73 (or any other router that replaces an existing router in an existing network) to use the same LAN IP address.

  @woozle 

Thanks for your reply, Woozle. I just went with the default settings of the AX73. The AX73 is configured on default LAN IP of 192.168.0.1 while the MR600 was 192.168.1.1 as you suggested.

I will change this setting but any other things to look for while I'm changing settings?

  @Zorro16 

Since everything was working fine with the MR600 it would make sense to configure the settings of the AX73 as similar as possible.

If that doesn't help, then maybe do a factory defaults restore on the AX73 and then try with a very simple network setup (change as few settings from the defaults as possible, just the one's needed to get the AX73 online) and connect just one single client device. In case you were still seeing dropouts even with the most simple network setup, then there might indeed be something wrong with your particular AX73.

  @woozle 

Hi Woozle. I tried to change the LAN address to the same as the old MR600 setting. Each time I saved that new address and rebooted, the ethernet connected devices could not find the AX73. Wifi was still working fine.

I then did a Factory reset as you suggested and stuck with the default settings for the LAN. The only change I made was to the WIFI settings. I turned off the auto setting so I could manually choose the 5gHz channel on my mobile devices. 

I played music via the ethernet connection from my Mac (Wifi turned off) for an hour with no dropouts. Did the same using WIFI with ethernet unplugged. Again no dropouts.

I'll keep testing and keep my fingers crossed but the Factory reset seems to have solved the problem. Thank you very much for your assistance.