Custom POI Audio Interferes With MP3s – I Think

So I just took my first interstate trip with my new, nuvi 660. With the tips and help I found on this great forum, I was set up before I hit the road. Custom vehicle (Lexus RX) icon installed, a bunch of MP3s loaded on a new 4GB SD card connected through a Sony cassette adapter (disappointed in the poor performance of the built-in FM transmitter) and the combined interstate rest area POI file with icon and sound alert installed.

So, I’m zipping south on I-75 in Florida, listening to the MP3s, following the audio directions, which just briefly interrupt the MP3s, as expected. Everything was working great. . . until I came to the first rest area. Knowing the rest stop was coming up, I looked at the 660 and saw the red alert in the text bar, but didn’t hear the audio alert. I did see the “REST AREA” icon displayed, so I got that installed right. Instead, the MP3 player skipped to the next song, 15-20 seconds later, the MP3 player again skipped to the next song. This behavior continued 3 or 4 times until I got out of range of the rest stop. The MP3 player had skipped ahead about 5 songs.

I went past 2 more rest areas on the trip. Each time, the same thing happened to the MP3 player. Has anyone had this problem? Is this normal? Do I have something set wrong or is this a known “bug” in the nuvi 660?

I think the audio level of the rest area alert voice is too low, which is why I couldn’t hear it over the road noise. I’ll run it through an audio editing program I have on my desktop PC when I get back home next week to check its output level. I can amplify it, if needed. What really gets me was the behavior of the MP3 player skipping songs all by itself.

I’ve double checked the naming of the POI, icon and sound files on my PC and they appear correct, right down to the capitalization:

RestAreas.bmp
RestAreas.csv
RestAreas.mp3

This is the only POI file I’ve installed. When I loaded it, I follow the recommendation and set the distance alert to 2 miles (10,560 ft.).

Any help would be appreciated.