@pritish11 

Hello, thanks for reporting the issue to the community, can I have more details then our engineers can try to investigate further?
1. As per your description, it seems that the wired connection of this WR845N is stable, it is only the wireless connection is not stable, may I know how many devices are connected to the wireless network?
2. Are all of them experiencing the same dropout or huge package loss, or just some special or old clients? Can I have some screenshots about this huge package loss?
3. Feel the router, if the router is hot or lots of heat coming out, put the router in a well-ventilated location or mount it vertically on a stand that permits the free flow of air, or use a fan to cool the router, a regular fan or USB fan is fine.
4. Set the Wi-Fi Transmit Power to middle or low (if the setting is currently set to high), and see if this helps.
I hope the above helps with troubleshooting the issue. Do reply to let the community know.

@pritish11 

Is there any change in your network when this issue starts to happen? Is the WR845N powered via the wall socket? Ensure there is no surge protectors.

When they got disconnected, is the wireless network of the WR845N still broadcasting or the wireless network is no longer available on all other devices as well?
If the devices are still connected to the wireless network but no internet access, please confirm if the devices can still get a correct IP address from WR845N, what is the IP address? Can you ping the WR845N gateway and internet? How to do this? Click here.
If the devices disconnected from the wireless and cannot connect back, what is the error message?

Who is your ISP? What is the model number of the modem? Ensure the modem is stable, you may connect a computer to the modem directly and confirm.