Disable Raise to Listen for Audio Messages in iOS to Prevent Weird Voice Text Behavior
Raise To Listen is a handy feature in modern versions of iOS that allow you to literally raise your iPhone to listen to a received audio message and to respond by sending a new voice text. But the feature is not entirely reliable for all users (particularly those who use an iPhone case, more on that in a moment), and as a result it can cause some annoyances where a message is inadvertently marked as listened or played, and because audio messages remove themselves by default, those audio messages may disappear from your iOS device without ever actually listening to them. Perhaps even more annoying is that some third party cases and protective screen products may cause the Raise to Listen response feature to trigger at inappropriate times or cut off in the middle of a voice text, sometimes sending an audio message that is incomplete.
Some Mac users running OS X Yosemite have discovered Bluetooth to become unreliable, either dropping device connections constantly or even simply not discovering a working Bluetooth device. For example, some users who are trying to 
In some specific situations, Mac users running OS X Yosemite may wish to re-download the complete installer application of a prior operating system like OS X Mavericks. This is typically something only advanced users would want to do, perhaps for making a bootable installer for the older OS X version, for upgrading a different Mac, or even to downgrade (more on that in a moment), but unless you have a compelling reason to download the prior OS X release installer there is little other reason to do this. 
Apple has issued a critical security update to OS X users aimed at patching an exploit with the network time protocol on most Macs. The update is labeled urgently as “Install this update as soon as possible” rather than a traditional name, perhaps indicating the importance of patching the unspecified issue with the Macs NTP.
