First of all my unit has 5 slides. I don't have any issues when opening my slides. However when closing my slides I usually have issues with the 3rd 4th 5th slides. The 3rd slide will sometimes stop about halfway in with me still holding the "in" switch in. The pump motor is not making any noise. I will hit the "out" switch for just a second then push the "in" switch and the 3rd slide out will travel in. Sometimes but not always I have to do the same thing for the 4th slide out but regardless I will have to do this routine for the 5th slide. The fluid in the reservoir is normal before I start and it looks normal when all slides are in. I was wondering if the switch could be bad or maybe an electrical issue with the wiring. If so how could I troubleshoot this ?