Experts, let’s continue discussing the issue of fractionation

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Experts, let’s continue discussing the issues related to the distillation tower. Something new has happened: at 3:00 p.m., the temperature at the top of the tower suddenly dropped. The temperature in the top circulation loop decreased by nearly 20 degrees within 15 minutes, while the temperature at the top of the tower itself dropped by almost 9 degrees. The temperature of the light diesel also decreased by 10 degrees. Only the temperature of the liquid drawn from the top circulation loop dropped slightly, two minutes later, before rising sharply and returning to normal on its own. During this process, the temperatures of the other trays remained normal. We cleaned the tower a couple of days ago, and this situation occurs only occasionally now. I think it might be a problem with the three-way valve in the top circulation system, or there was some kind of fluctuation at that moment