GPU simulating process always stop & DEM RigidAlgorithms Error

Two problems in this topic:
1. When running a calculation with GPU, the process always stop at some steps, , it will not continue until I press the Enter button in the cmd window. Has anyone encounter the problem? if the num of particle is large, it will happen several times.
2. In simulation of some fluid-solid couple problems, if the RigidAlgorithm is DEM, an error will be thrown out as "Text:Fixed, moving or floating particles were excluded. Checks VTK file Error_BoundaryOut.vtk with excluded particles". It seems that some particles (DEM or SPH particles) run outside of the domain, and the error happened in some dp size, so whether there is any rule about the particle size of rigid body and the fluid?
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