@Joseph-TP TP-Link Archer C6 সারাদিন ধরে নেট ছেড়ে দিচ্ছে।  Provider কে বলছি ওরা বলে রাউটার অন/অফ করতে।। কিন্তু provider এর কথায় রাউটার অন অফ করলে সেই একই সমস্যা ..কি করবো ???
#HelpPost 

Please read it to translated Bangla to English... 

Hi@SayeemAhmed,

According to the translation of Google Translate, I think that your question is the unstable internet on the Archer C6. If there is any discrepancy, please describe it in English.

There are a few different cases related with unstable connection, including WAN connection unstable and wireless client devices unstable.
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?
For wireless client devices unstable: 
    1) Make sure the Router is properly placed, it should be put in open area instead of inside a cabinet or shelf.
    2) Login the web management interface of the Router, go to Advanced > Wireless > Wireless Settings, change the wireless channel into another one.
    3) For 2.4GHz wireless client devices, adjust 2.4GHz channel width into 20MHz, for 5G wireless client devices, adjust 5GHz channel width into 80MHz or 40MHz to avoid interference.