yamaha rx-v665 receiver doesnt communicate with the remote

May 22, 2018
last night the remote suddenly stopped controlling the receiver. none of the controls buttons on the remote did anything. at first I thought it was the remote, but now I am thinking perhaps the remote and receiver don't communicate any longer. are there any test I can do to find out which one has the problem?

before you ask the obvious, yes the batteries are good.
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