Dolphin done rubbed the pattern off my liner

Auburn02

Well-known member
Oct 8, 2019
325
Mobile, AL
My pool/liner/Dolphin S300i are all just coming up on 4.5 years old. Overall the Dolphin has done its thing admirably, but last summer or possibly even the year prior we started to see it leaving a consistent wear track around the shallow end where the wall meets the floor at a 90 degree angle, as a result of the tracks rubbing against the floor while starting to climb. We used to run the thing daily in the spring through fall, because - crazy us - we like to have a clean pool but when this started we reduced to minimum necessary as I’m concerned eventually it’ll wear away more than just the printed pattern. I always just sort of assumed this is something you have to deal with when using a track robot with a vinyl liner.

Fast forward to today, I dropped the Dolphin off to be diagnosed for some unrelated behavior that started last year following an electrical surge, and I happened to mention it to the tech who was adamant that this should not happen. So what’s the deal here? Normal or not, if not what could be so special about my setup that would cause this?
 

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I did originally think the track was from it running on the floor and running parallel to the wall, but I'm nearly certain instead it is where the robot impacts the wall and then starts trying to climb, with the back of the tracks being the only point of contact on the floor until it gets vertical. Could be either really, but it sucks all the same.