bought a new mini kota 40 lb thrust motor in may! used it one month an it messed up! so i got it repaird. at a authorized dealer. used it three more times an it messed up again. can any body tell me a good trollin motor to get. i have a 14 ft eldorado boat that me an my two boys use at twin buttes. dont have a gas motor. any advice will be a lot of help.