Tige Problems?

Hey, I currently ride behind a 2002 Tige 20v riders and ever sense we got it weve had so many problems. Electrical, engine problems you name it, Today it was working fine for all day and then it just stopped working, sounded like the battery was dead but it was full charge. It really maeks me made because I just got it back from the shop 2 days ago for fixing the water intake. Anyone have similar problems? I think the same electrical thing happend a while back too, but i cant remember because of all the other problems. It just makes me mad. Oh and only 2 out of the 6 speakers work too.

oh by the way anyone know the best weighting for a 20v? we mess around with it everyday but usually by the end of the night there are like 10 people in the boat. so whatever we start out with just gets more and it seems to become overkill. just curious.