@Avinash_tyagi-9 Hi, we have received your email with logs, we would like to escalate your case to the support engineers, and they will help follow it up, if you are willing to do further analysis,...

@Manuth Are you able to confirm if client devices of the MR6400 are still able to access internet or not when the device is offline on Tether App? If internet stops working as well, it would be LTE...

@mehdik2 Hi, MR600 V1 has been discontinued for years, and for newer firmware, please refer to this thread: https://community.tp-link.com/en/home/forum/topic/579834

@Avinash_tyagi-9 Are you using Airtel SIM card now? or Jio SIM? and is your Jio SIM still 4G or has upgraded to 5G? For Jio SIM issue, it might be the same issue as this thread: India Jio SIM stops...

@owen243 Hi, please confirm if there is any LED changes when the problem happens, especially the DSL LED and Internet LED, is the DSL light still solid on or will it turn off or flashing when you...

@Hawmaus Hi, do you need additional powerline extenders? If so, you could add another TL-WPA7510 KIT or other TP-Link Homeplug AV/AV2 powerline devices.