iPhone 5S (iOS 7.1) Intermittent

After installing latest iOS 7.1, my sounds (ring tones, alerts, etc) seem to be intermittent. Most phone calls just vibrate with no sounds. Checked Settings as well as Contacts profile (specific ringtone), and they are all set okay, i.e., checked and phone played the specific sound set. Anyone else have this problem?

I've been running 7.1 since the update on my iPhone 5 and no problems here. Maybe you could try shutting the phone off by holding the power and home buttons. Give it a few minutes and start it back up. See if that does anything for you.