Steve,
The battery solution seems to be keep it charged. As Mr_Tony has said this has been featured elsewhere on the forum.
With regards to the speaker not working this would suggest a loose wire. If it does involve gaining access to the rear parcel shelf it maybe worth getting the dealer to have a look at the fuel tank breather pipe.
I have an issue with mine which means the engine management light comes on. Been to a local dealer this morning to identify the problem. Given your distance from the dealer a bit of preventative action maybe a sound move.
Now when will you let go of the Indian summer and send it our direction. It'll make a change from Ash clouds.
