So we are a WISP and have a broadcast of Wifi with sectors and connect the clients with LHGs to the sector. From the LHG we attempted to connect a TP-Link archer router. On this connection, the connection over PPPoE to our base stations lasts only a few seconds before timing out and giving an "Encryption got out of sync" error and disconnecting the client. This process keeps repeating endlessly and was found to be only applicable to TP-Link routers where other brands give no issues. Any advice what the problem might be?