Recently there have been reports of Alexa devices either not hearing the wake word as well, or hearing it but not completing actions from commands.
Apparently, this can be a result if you have Enabled the Wake Sound. Turn it off and try again.
It sort of makes sense considering that enabling the wake sound means a few milliseconds more are added before Alexa becomes responsive. This is being reported more frequently, so be sure that Amazon is working on a fix.
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