I got a Roborock S8 Pro Ultra last year and it's been great overall, but lately it keeps getting wedged underneath my couch even though it fit fine before. The couch hasn't moved. Is something wrong with the sensors or has the vacuum gotten slightly larger over time from wear?
The vacuum isn't getting larger from wear, but a few things could explain why it's suddenly getting stuck when it wasn't before. Dust and debris buildup on the sensors or wheels can actually affect how the vacuum navigates - if the cliff sensors or bump sensors get caked with dust, they might not detect the couch edge properly and send incorrect positioning data. Also, if the brush or wheels have worn down slightly, the overall height profile changes just enough that clearance gets tighter, especially if your couch sits particularly low to the floor.
Check the sensors first by wiping them clean with a dry cloth, particularly the ones on the underside and front bumper. While you're at it, clean the wheels and brush thoroughly - you'd be surprised how much packed-in dust can affect performance. If that doesn't help, measure the clearance under your couch with a ruler and compare it to the S8's stated height when running. Sometimes the issue is simpler too: has anything shifted slightly under the couch that's now blocking it, or has the floor settled in a way that makes that spot lower than before?
If cleaning and measurements don't reveal the problem, try rearranging furniture temporarily to see if the vacuum gets stuck anywhere else. That tells you whether it's a sensor issue with that specific spot or a general problem with the vacuum itself. You might also check if there's a recent firmware update available - sometimes positioning algorithms get tweaked in updates that affect navigation patterns.
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