Hi,

What is the light status of the RE355 when this issue happens? And can you access internet from the RE355 at that time? Please check the IP address and default gateway obtained by your client with it connected to the extender. 

https://www.tp-link.com/support/faq/838/

how far away between the extender and main router？ Have you setup different wifi name for it? 

Besides, it is suggested to troubleshoot and narrow down the root cause as below instruction: https://www.tp-link.com/support/faq/2233/

What is more, please tell us the current hardware and firmware version of the extender. 

Have a nice day. 

Hi,

Thanks for your reply.

May I know what is the model number of the main router？

And when and where did you buy this extender?

Thanks in advance, and have a nice day. 

wasabicola wrote

The light status is on blue, I can access the internet but it always say dns problems and stuff like that, sometimes on my phone it will ask me to sign in to connect to the internet and sometimes it would connect and disconnect over and over again until i restart the RE355 to get it to work again. Checked with the ip address they are both the same, let me know if you need the ip adress 

The main modem to the RE355 is no more than 10 meters, didnt change the wifi name

 

did try the troubleshoot, didnt help..

 

current hardware is v1 i think? its using the latest firmware