All about the Roland Jupiter-series

hello,

  There are some problems with my jp8... the most annoying one is 
that I cannot save my patches! Everytime I turn it off, the patches I 
stored are gone forever. I did some tests, the memory only lasts 20 
seconds after power off. The patches made by its former user are all 
crappy and cannot be rewritten...

  Maybe it's the battery which should be replaced? the manual says it 
should be replaced every 3 year... Any ideas? 

Thanks,
mooby