Thanks for the info on the Plus. I called the 800 number listed on the instructions and they said to wash the bag because of the density of the fabric. I'm not sure if that will help with the suction of the machine, but I'll give it a try. The directions say when the Rover makes its first move across the pool it will be in a straight line. Mine never goes in a straight line. Does anyone else have a Rover that does this? Thanks for the info. Denise