@farzi_cricketer 

Hello,

Sorry for the trouble caused, we will do some troubleshooting and try to fix it. 

Are all the LEDs on the WR845N solid on and no internet access both on wired devices as well as on the wireless clients? What if you connect a computer to the ISP modem directly, will the internet still work properly? 

How often does this freeze issue occur? Try to turn it off when you are not using the internet.

When the network stops working on the WR845N, please check the IP address and default gateway with your computer connected to it and show me the status-details page. Instruction as below:

https://www.tp-link.com/support/faq/838/ 

Can you ping the default gateway on the computer? 

How many devices are connected to this WR845N, wired, and wirelessly? Try to reduce the clients and monitor again.

Thanks a lot.