Starting about a month ago, every once in a while my phone will not ring when someone calls. The phone will be on full volume, but when someone calls, there is no noise and I don't know about it until I see the missed call icon in the notification bar. The call has come through and I can see my contacts photo and the "answer" and "ignore" options, but it's completely mute. This happens with anyone that calls during this period, it isn't limited to certain contacts.
The only way I have found to resolve the problem is to restart the phone. I haven't rooted the phone or done anything else of the sort and really want this problem to get fixed. The only related thing I can think of is that I've used MP3 Ringtone Maker to make ringtones for many of my contacts.
Thanks in advance for the help.