I rarely have issues.
Only leaving my brother's house do I need to turn off the cameras so the system doesn't engage as he's on a very steep incline so the car sees the group and gets spooked.
Even with the sensors less than clean. I need to wash the car after my drive up to upstate NY and the sensors are still working smoothly.
I would clean them as noted by others and if you still have issues with the sensors cleaned then I'd engage the dealer as they could have been knocked around or be faulty.
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