Kyle
Ansys Employee

No, this shouldn't be a problem. The autoshutoff level is just an estimate of the remaining energy in the simulation region so it's normal for the autoshutoff level to increase a bit over the course of the simulation. I would say going up to 5 is a bit unusual but it's not necessarily a problem. Still, you might want to double check some of the issues that can cause a diverging simulation on this page, to make sure there is no divergence in the simulation:
https://forum.ansys.com/discussion/25566/ansys-insight-diverging-simulations