Hi guys,

A weird one that happens for the past few days now.

I have my Archer C9 from 2016-2017. All good up until now.

My router resets itself if I do the following:

1. I do a speed test using the Ookla app on my iPhone 13P. 

2. I play something in 4K on my SONY Bravia (Disney+ or HBOMax)

At the moment, I'm connected to the internet via cable to the router. All works well. If I do any of the above, the last 3 blue leds go crazy for a few seconds and the router will reboot itself.

Also, I have a 1GB internet connection from my provider.

On the PC I can do the test, compared to the iOS test which kills the router altogether, however, it doesn't do more than 304Mbps (down) / 175Mbps (up)

Any advice is more than welcome. I love this router and it served its purpose up until now. I wonder what/how doing the above can do this and how can I fix it.

Thanks