Hello,
It sounds like you might have an IP address conflict. Make sure the upstream routers are in a different subnet from the RUTX10 (e.g. is RUTX10 is in 192.168.1.0/24, then the TP-Link device could be in the 192.168.10.0/24 subnet).
If that does not help, I will ask you to update to the latest firmware which can be downloaded here, then in the WebUI, navigate to System → Administration → Troubleshoot and download the troubleshoot file. This file can be attached to the original post and will only be visible to Teltonika moderators.
Best regards,
DaumantasG