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adb devices reporting Nexus 7 offline

Occasionally run into a problem when switching devices (unplugging one device and plugging in a different one to collect logcat information), “adb devices” reports my Nexus 7 (running 4.2.2) as offline.  Bouncing the adb service (adb kill-server, adb start-sever) doesn’t fix it, either use unplugging the device and plugging it back in.  So far, one method (discovered by accident seems to work the best) – putting my mac to sleep (this often happens due to having to attend meetings) when I return and run “adb devices” again,the Nexus 7 is no longer offline – wacky but it least it works.  Will try putting the mac to sleep on purpose next time to see if it works.