Error on one print

Hi there, I am printing the Tie Fighter and have a problem on the main part. The upper part is really nice but the bottom have some strange errors that i have never seen.
Any idea ?

Printing @ 0.1 with PLA basic from Sunlu calibrated, 100 mm/s, 3 walls, other parts are really nice

Tried again with 0.08 but same error, my son the boss, start to put pressure on me, please help ahhahahahaha

the file, rename form .jpg to .stl