We have a WDS bridge setup for our network, the root router (#1) is a TP-Link TD-W9980 (Dual-band N with built-in VDSL2 modem) and the extending router (#2) is a TP-Link Archer C7 (WDS is enabled for 5GHz) which has a different SSID. This setup has been working very well for most devices.
Recently we picked up a new USB wireless network adapter (TP-Link Archer T2UH) for one of the PCs because the existing one was acting up (TP-Link WN8200ND). This PC runs Windows 7 and connects to the network of router #1 (better signal strength).
However, upon installing the new one, when connected to router #1 that PC can no longer access or ping any devices connected to router #2. Switching back to the old adapter makes it work again, and testing the new one on my laptop showed the same results.
For example, a PC with a wired connection to router #1 has the IP 192.168.1.101 and is accessible, but my PC has a wired connection to router #2 with IP 192.168.1.103 and is not accessible.
Is the adapter DoA, is it a bad product (due to its use of the notorious MT7610U chipset) or am I missing something?