@Volkan_Akkus_TR The DSL parameters in the status menu are the indicators of your DSL line quality:

@Kelvin1678 Just follow the blue text hyperlinks in my previous post for more details on these.

@Kelvin1678 Yes, you can still use the M5 with BE550 but I would suggest to set M5 in AP mode to avoid the double NAT in your network.

@AX55FixFix There's two options that could cause this issue. 1. Bad ethernet cable (more often) - change the cable with another one of a good quality. 2. Bad Internet connection port recepticle (less...

@bogdanws Here's the guide for registering or modifying a TP-Link DDNS. If after all you can bind this TP-Link DDNS just regiter a new one.

@Mossycheong If this issue has been observed only with this device then probably you should look into its network adapter settings/properties, outdated drivers, etc. If afer all, you can't pinpoint...