etabs运行分析出现警告，求行家指点？

我做的是32层混凝土剪力墙结构的分析，模型检查没有错误，运行分析出现如下警告，求指点？？
* * * W A R N I N G * * *
THE SOLUTION LOST 7.7 DIGITS OF ACCURACY FOR DOF U1 OF CONSTRAINT 32
LOCATED AT X = 17.094401, Y = 7.119904, Z = -2.66E-15,
STIFFNESS MATRIX DIAGONAL VALUE = 5.2695E+15


* * * W A R N I N G * * *
THE SOLUTION LOST 7.9 DIGITS OF ACCURACY FOR DOF U1 OF CONSTRAINT 31
LOCATED AT X = 17.095231, Y = 7.123062, Z = 2.900000,
STIFFNESS MATRIX DIAGONAL VALUE = 5.2695E+15


* * * W A R N I N G * * *
THE SOLUTION LOST 8.0 DIGITS OF ACCURACY FOR DOF U1 OF CONSTRAINT 30
LOCATED AT X = 17.095231, Y = 7.123062, Z = 5.800000,
STIFFNESS MATRIX DIAGONAL VALUE = 5.2695E+15
……