Why is the condensate pressure in the stripper reboiler low?

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In the First Automobile Factory’s distillation column, which features a siphon reboiler at its bottom, there have been recent fluctuations in the pressure of the reboiler’s condensate; meanwhile, the column pressure and liquid level also experience fluctuations. During the investigation, it was found that if the condensate generated behind the steam trap was discharged directly on site, there were no fluctuations in the condensate pressure, as well as in the tower pressure and liquid level. It was preliminarily determined that low condensate pressure was the cause of the inability to carry out continuous condensate recovery; instead, recovery occurred in intermittent pulses, which led to fluctuations in tower operation. The same phenomenon occurs when the condensate is recovered directly through temporary pipes from the drain before the steam trap. Previously, the entire system was stable, with no fluctuations in either the upstream or downstream components. However, recently there have been fluctuations most of the time, though brief periods of stability do occur occasionally. I would like to ask everyone now: how can adjustments be made to stabilize the entire system?