Why does the mower leave the grass uncut in some areas even after the VisionFence is installed?

When the light on the mower flashes yellow or blue, it means that the positioning quality is not good at this time, thus Navimow will adopt a more conservative obstacle avoidance strategy near the boundary:

a) When the mower is mowing along the edge, in order to ensure that it does not hit any obstacles near the boundary, the mower may skip a small part of the area, especially areas around the corner. Often, these areas may be covered in the next mowing task.

b) When the mower is performing a planned cut, in order to ensure safety and efficiency, if it encounters any obstacle near the boundary, the mower will turn around and go to the next planned mowing route. Therefore, in narrow lawn areas, there may be more uncut areas. Every time the mower completes a mowing task, it will change its direction randomly. The part that has not been mowed this time will be mowed in the next several mowings.

If you think those areas are safe even when the GPS signal is bad, you can use the VisionFence-off zone feature to set this area as a VisionFence-off zone. Go to Setting - map management - add more - VisionFence off zone.