@Soire Hi, sorry to hear that. Just to verify, what is the model number of the TP-Link device, is it C5400 or C5400X? How about its hardware version and its current firmware version? Do you mean...

@Vijayk Hello, sorry for the trouble caused, we will do some troubleshooting and try to fix it. May I know who is your ISP? Ensure you have a stable connection from your ISP modem by plugging a...

@sabujp Hah, NP, thanks for replying, and hope the replacement will work fine for you. Nice day~

@Nike-Tom Hello, We would like to follow up this case via email, and our engineers will email you, if you are willing to do further analysis, please check your inbox and respond. Thanks for your...

@Kourosh Hello, thanks very much for all the details. When did you buy this router? Are the two repeaters connected to the C9 before or you use them recently? What if you disconnect the 2 repeaters...

@Sharan7 Hello, thanks for bringing this up again. How about the wired connection and 2.4GHz wireless connection, are they stable? When the 5GHz drops and shows a "couldn't authenticate connection",...