You are losing sounds after a few minutes because your device only has 32Mb and it can't handle the load with your current setup.
Since you don't mention what other maps, navcores and voices you've tried and which methods you've used to install everything, I can only guess that you've done something that is not meant for your 32Mb device.
Losing sounds can be caused by using the wrong map, so 885.4009 is worth a try. In your case though, I suspect you are using the wrong computer voices. If you're trying to use LoquendoTTS, then that's where your problem is. Use VocalizerTTS voices instead. Follow this tutorial:
The following setup I use with my 32Mb ONE never lags, never drops out and never fails:
Navcore 8.562 SE
full featured IQ/ALG map - similar to Europe 885.4009
VocalizerTTS voice "Samantha"