Please help with a delayed ring problem

[tvandyck7]

I am experiencing a very delayed ring when I am called. Most of the time it will only ring once on my end before I miss it. When I call back, the other person (my wife) says that it had rang 5 times and went to voice mail. If I happen to have the phone in my hand, I notice that it does light up, but it takes several seconds to actually ring. I can't just hold the dang thing all the time in anticipation of a call. Is this just a custom ringtone issue? I even used the mp3 trimmer and cropped the silence out of it. Helped a little but not much. Anyone have anything on this?