I am creating a new video skill. Few months ago I was able to call the command without specifying the target device (if I have once invoked recently) . For example following was ok
1. Alexa, channel up on Rock Player.
2. Alexa channel down
If the second command was invoked after few minutes , alexa was able to understand the target. This has changed now and I have to specify the target name each time. How can this be changed?