Using an iphone 5 with over 50% of space free, but when I get a text message and either click on the notification or manually open the message app, the phone lags for a few seconds, or even locks up. Only lasts about 3-5 seconds but it's very frustrating. Also, it only happens every other text message or so. Any ideas on where I can start to troubleshoot this problem? Also, although I back up messages to icloud, I'd like to back up some messages to my mac so I can permanently delete them from my phone. Any suggestions on how to do this? I did a google search and couldn't find a good solution. Thanks!