Is the Allfa Romeo Spider JTS Lusso Convertible 2003 knowm for electrical problems?

My husband & I have had this car for a few months now & have just starting having problems with what seems to be the electrics. We have discovered that the battery is housed in what would normally be the back seat, but the connections do not seem to be very stable & therefore this seems to be knocking off all the electrical stuff – lights, indicators, etc. Does anyone out there know if this is a pretty easy problem to solve or is it going to cost an absolute fortune.
All replies are most welcome