Drawing is Busy - AutoCAD problem

CODE URL:https://www.dropbox.com/s/hy6cq4htnnbn2na/Drawing%20is%20Busy%20-%20AutoCAD%20problem.txt?dl=0 what is drawing is busy problem in AutoCAD? how to solve drawing is busy problem in autocad? AutoCAD problem drawing is busy AutoCAD then crashes hangs losing all work from last save acaddoc.lsp, acad.fas acad.vlx autocad suddenly closed and lost my work