Hi,

The top one is the latest firmware: https://www.tp-link.com/support/download/td-w8961n/#Firmware You can update it to the latest one and give it a go.

Note: How to upgrade firmware: https://www.tp-link.com/support/faq/107/

You mentioned that no device can connect to the wifi about 6+ hours with no activity or connections, is there any error message if they cannot connect to it? 

Besides, what about the devices which have connected to the wifi already, are they able to get internet? 

What is the light status of the 8961N at that time? Please login to the web interface of the router and take a screenshot of the status page.

What is more, when did you buy this router? 

Thanks in advance, and have a nice day. 

"wrong password" error appears on mobiles and "can't connect" on laptops. Typicaly this happens when all are asleep so no devices are connected to the network but it happened once or twice when other devices were connected and they could get internet normally but others suffered from that problem. Also it happened once that the laptop lost it's connection all of a sudden and couldn't reconnect due to the same problem. When this happens all lights are normally light but no blinking. I'll try and screenshot the status page when this happens again but I can assure you nothing seems out of the ordinary, except that there's 0 wireless connections. I bought this router last December.

Hi,

Thanks for your valued reply.

To do further analysis, please take a screenshot of the status page of the router. 

Meanwhile, have you ever tried to upgrade the firmware, any updates? 

Good day.