Nighthawk XR500 will not connect to wifi internet after rebooting

[JPA1010]

Each time I make a change in the settings of the router (QOS, Bufferbloat settings, etc.), I reboot the router (which I read is recommended).  However, once the reboot is completed, connecting to the internet via wifi does not work (connecting to the internet via ethernet cable works).  Since I cannot connect to the internet via wifi, the only solution is to restore the router to factory settings.  Any solutions to this issue?  Thanks in advance.

[Netduma-Fraser]

Hi JPA, I've responded to your topic on the Netduma forum about this so lets keep our responses there for ease.