Howdy AndiManning,
Thank you for your question! It sounds like your phone calls are going straight to voicemail and you have to restart your phone to get your text messages. I had a couple of things to recommend. First, check to see if Do Not Disturb is on in the phone settings:
iOS: Using Do Not Disturb
http://support.apple.com/kb/HT5463
You can use the Do Not Disturb setting to silence calls, alerts, and notifications.
- To enable, tap Settings > Do Not Disturb. When Do Not Disturb is on, a "moon" icon will appear in the status bar.
- To make changes to your Do Not Disturb settings, tap Settings > Do Not Disturb.

If this is turned off, I would next close all the apps on the phone that are running, and restart it one more time, and retest the issue.
iOS: Force an app to close
http://support.apple.com/kb/ht5137
Double-click the Home button.
Swipe left or right until you have located the app you wish to close.
Swipe the app up to close it.
If the issue persists, I would next backup your device to iTunes, and restore it:
iOS: How to back up and restore your content
http://support.apple.com/kb/HT1766
Thank you for using Apple Support Communities.
Take care,
Sterling