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I have a level measurement system by fmcw radar (Rosemount tankradar), for a filling-emptying process, of very large water chambers. Very sporadically, the radar is momentarily lost and measures 4 to 7 feet below the actual level, only when filling the water chamber. Sometimes the measurement freeze in the middle of the filling process. Due to the criticality of the process, this behavior is dangerous, as it can cause flooding inside the plant This behavior is very sporadically so we are baffled about the root cause of this problem.