Hallo, I am running MIKE21/MIKE11 simulation on rivers (MIKE21 recatangular grid) and simulation stops with message: "FlushFile: Unable to flush file Abnormal completion" It stops in the moment, when it should write the od M21 result file to disk (dfs2 - H,P,Q and Surface elevation items). First 5 steps were written withouut problems. I should mention that: - there is enough space on HDD, - the RAM memoriy is more then 50% free (>16 GB), - that I was running 4 different simulations simultaneously. I have read this thread (https://support.dhigroup.com/forums/mike21/7c14fd17-13e3-ec11-bb3c-000d3ab6f50d) but I would like to point out, that this issue never happened before altough we were often running 4 simulations simultaneously. Does anyone has any clue what could have caused the problem? Thanks in advance Timotej