That can be one cause. Another is if the mechanism that positions the laser and reader gets sticky (aging grease) and does not move the assembly smoothly. Either way I think it's a good time to contact the manufacturer to enquire about a checkup and possible transport replacement.
For reference the transport in a Marantz CD17KI (VAM1201) costs about $25 from an electronics supply, and includes the motor, the laser, the sled that positions the laser ... the whole shebang as a single replacement item.
For reference the transport in a Marantz CD17KI (VAM1201) costs about $25 from an electronics supply, and includes the motor, the laser, the sled that positions the laser ... the whole shebang as a single replacement item.