I am modelling retaining walls in ABAQUS with relief-shelf basically called as relief-shelf retaining wall. But while submitting the Analysis for different lengths of shelf it is again and again showing - "The plasticity/creep/connector friction algorithm did not converge at 12 points" and in some models "The system matrix has 2 negative eigenvalues". I have checked all the analysis steps thrice but not able to figure out the problem. Also since I am providing different displacement in steps for Active condition like Active 10mm,20mm and so on. But in analysis in one model it is getting aborted on Active 20mm condition and in other model with same properties and configuration it is getting aborted in Active 40mm condition. What can be the possible solution please tell??

Abaqus ​​​​​​​