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Your warning messages are loss of accuracy. Nothing critical as you don't have any stability warnings. Normally, what you can do is that wherever you have a **Warning** message, you can go to the joint of interest; for information below, error is for UZ at Joint 3354, and zoom in to the Joint for visual inspection to see if everything looks good. * * * W A R N I N G * * * THE SOLUTION LOST 7.8 DIGITS OF ACCURACY FOR DOF UZ OF JOINT 3354 LOCATED AT X = 66.600000, Y = 30.650000, Z = 18.400000, STIFFNESS MATRIX DIAGONAL VALUE = 5.0055E+15 I haven't used ETABS in years, but, I remember that when I used to get such messages, I would check the joints, zoom in and would always find some kind of misalignment of slab with beam. The slab or beam would not align and there would be some gap or misalignment. You can spot it visually if you zoom there. You can then redraw the slab or refine your mesh there. Give it a try and post any pictures of mismatches that you find. Thanks.