We've been using a wired Polaris pool robot, but it recently stopped working. It seems like a motor issue, as the motor starts spinning but stops after a few seconds. I found a replacement motor on eBay, but since it's used and I'm not entirely sure the motor is the only issue, I'm unsure if it's worth the time and money to repair it (eBay has no return policy if I buy motor from there). The unit is over six years old, so I'm also considering replacing it with a new robot. Do you have any recommendations for reliable pool vacuum robots for inground pools? Also, what are the pros and cons of corded vs. cordless models?