Hi@Behrozkhan,

Thank you for contacting our community.

Is the router working on wireless router mode now?

Please tell me unstable issue is on wired connection or wireless connection?

For wireless client devices unstable: 
    1) Make sure the Router is properly placed, it should be put in an open area instead of inside a cabinet or shelf.
    2) Change the wireless channel into another one. You may refer to Changing Channel and Channel Width on a TP-Link Router (new logo).
    3) For 2.4GHz wireless client devices, adjust 2.4GHz channel width into 20MHz.

For WAN connection unstable (Router Internet LED turns red/orange occasionally): 
    1) Connect a PC directly into your modem to verify if your ISP Internet is stable.
    2) Make sure the Ethernet cable between your modem and the Router is connected properly, replaced old cables with new ones.
    3) Change the DNS Server of the Router, login the web management interface of the Router, go to Advanced > Network > Internet > Advanced Settings, change the two DNS Servers into 1.1.1.1 and 8.8.8.8. How to Change the DNS servers on the wireless router and DSL modem router (New UI)?
    4) Go to Advanced > System > Firmware Update to upgrade the firmware of the Router. How to Upgrade the Firmware on the TP-Link Wi-Fi Routers?

Best Regards~