Minn Kota Rip Tide 70

[plumber69]

I'm pulling my hair out with a new rip tide. Motor is wired correctly and the 50 amp fuse is in place. The first trip out, I got 4 hours use out of it before it died. I took it to Minn Kota authorized service center and was told the brush holder was bad. Took it out this weekend and got maybe 20 minutes before the same thing happened. I was asked if I was running it hard. I do not understand this question because I was going against the tide for the 20 minutes but cannot believe that this would cause a brand new motor to burn up. I talked to a few other people and their salesman asked them the same question about running it hard. Is that the same as telling me I shouldn't run my outboard motor wide open? Has anyone else had a problem with these motors? I did return it to Academy with no questions asked and got a new one. Hoping this was just a lemon.