@Markus-2023 Hi, what is the model no. and hardware version of your TP-Link device? Please follow this guide to do some troubleshooting first: Troubleshooting guide of no internet access with TP-Link...

@Tomeksan Hi, is there anything special before the issue started? such as a power outage or firwmare update etc.? Please make sure you are using TP-Link original power adapter and also try different...

@Bikash785 Hi, do you mean the MR6400 will turn off automatically after you turn it on for 10s? and it will be off completely or it will reboot itself? Please confirm if you are using the original...

@Lynxx_ Hi, are you still able to install the antenna and screw it tightly? If not, it is recommanded to contact the retailer where you bought it originally to check the warranty and get it replaced.

@Td-w9970 Hi, MR3420 V5 only supports IPSec VPN.

@TimGUK Hi, MR600 doesn't support bandwidth control, to limit the data usage, you could consider using the data usage limit feature to limit the monthly or total data usage, however, it will not...