The file SilentHunter4\Data\Cfg\Main.cfg contains the maximum time compression levels based on the event that occurs. There is likely an event that you explained which has the time compression level set to 1. You could change that to a higher level to maintain a more speedier flow. If the event occurs, any applied higher TC gets reduced to that level. But don't come complaining if that actually gets you killed because of neglecting attention to crew reports.
