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The default gateway could be missing or wrong defined.
Can you show the output of "ifconfig" and "route"?
You could try using another power supply at the router (maybe the one from the old router). Just make sure it has the same voltage and polarity and an appropriate amperage rating.
Using a _non_ shielded ethernet cable may also help. (The BBG ethernet shield is connected to antenna ground. And some routers ethernet shields are connected to their PSUs minus pin)