Hi Tp-Link Team

I purchased this Archer A6_Ver 2 (US) router in March 2020 in India. Till now it was working fine (even 1 month back). Recently, I am facing frequent disconnection using this device.

I have 8-10 devices connected with router ( Mobiles, laptops, smart TV, smart speakers etc). 
It usually happens after 1 hr -2 hr use of it. Router home page status is showing " internet is connected" but there is no connectivity. Sometimes the 5G signal is also getting lost completely. Every time, I have to restart the router to start its' operation. 

Now, I have purchased another TP-link Archer C6 (US) .(Ver 4.0), I have connected that similar way in the place of Archer A6 (US, V 2) old router, then the new one is working absolutely fine. 

I am using Tata-play fiber connection, the router is connected with tataplay router from lan to WAN port (as input) using dynamic IP (Router mode).

Please suggest 

Thanks in advance.