Has Periodic Maintenance Frequency been set to Low?

If Periodic Maintenance Frequency has been set to Low, change it to Normal. Changing this setting to Normal will increase the number of cleaning operations, preventing dot drop-out and dot displacement.
MEMO

You can decrease the number of cleaning operations, reducing ink consumption, by setting Periodic Maintenance Frequency to Low.

However, the risk of dot drop-out and dot displacement will be higher than when Normal is selected. Change this setting as needed only when setting up a print object with a thickness of 2 mm (0.07 in.) or less.

Default setting: Normal