I had the same issue. I found that Strength→Advanced→Infill Combination was enabled. This basically doubles the Layer Height to .6 for just the infill. This makes the filament droop/sag as the infill are now all bridges. The A1 default settings for cooling cannot keep up. Increasing cooling can help. Turning this option off does increase print time but increases strength and does not sag.
Thanks for the info! I will look at that for sure.
More research shows that the .6 layer height from “infill combination” is more than the setting PrinterSettings→Extruder→layer height limits→Max which is .42 . If I manually set layer height to .6 then BambuStudio warns that .6 is over the max of .42. In this case with infill combination enabled it does not warn and just tries to do it. It does a poor job as it is above the max. I verified this by printing a test with Layer height of .6 with gyroid infill and the print shows the same issues with sagging.
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