i have the following router (archer C6 (1200mbps) v2 on latest firmware 1.3.6) since march 2020. it was working perfect until a few weeks ago. after a week 5ghz wifi stops working so i had to reset the router. since yesterday it stops 2 times per day. i didn't change any settings in my modem from my IPS or the TPL-link router. i only tried to change the channel and channel width, but it doesn't help. any ideas how to fix it? Otherwise i'm going to ask for refund at amazon...

i changed the version from auto to wpa2 and encryption from auto to aes and transmit power from high to middle because i did see this in another thread. maybe this will work?