Help, Audible Alerts not working

I had this setup working just fine. Now for some unknown reason the audible alert has stopped functioning. Here are the details. Please let me know what I am missing....
>>Garmin nuvi 350
>>Using Garmin POI loader version 2.4.2
When loading POI's I select the default 'express' mode.

I am storing all my POI files in a folder called "POI's"
My speed cameras are located in a sub folder called "Speed Cameras (MPH)". Within this sub folder all of my files are named as such:
35MPH.csv
35MPH.bmp
35MPH.mp3

When viewing the custom POI's on the device it displays the following:
Proximity Alarm
Distance: 1847ft
Speed: 35mph
Everything is perfect right???

I checked the settings and confirmed proximity alerts for both custom POI's and Garmin Safety Cameras are active.
While driving past the speed camera I am getting a visual text alert with a red bar at the top of the screen and I am getting the bitmap image displayed on the map. The only thing not working is the audio alert. All other audio functions of the device appear to be working.

Here is what's really strange. For a while only the speed camera audible was not working. The red light and golf locations were triggering audible alerts just fine. now none of them are working. It all seemed to start going haywire after just one time I tried loading my POI files using manual mode instead of express. I have since removed all POI's and reinstalled using express mode but to no avail.
Let me know what you guys think I should try next. I'm thinking of doing a master reset.