The main issue regarding mercury catalyst consumption in the acetylene method for vinyl chloride synthesis

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I would like to ask the experts: In my company, the operating time of mercury catalysts used in the past was always over 10,000 hours, with a consumption rate of around 1.02. But recently there has been a sudden change – the operating time has dropped to around 5,000 hours, even though all controls are the same as before (in fact, they should be even more effective). Now, when the converter is turned on, there is a significant amount of mercury loss at the site, yet the temperature has not exceeded the limit. It’s just that the following aspects are different from before; will that have an impact? ? ? 1. The circulation of heated water has been changed from forced circulation to natural circulation ； 2. The temperature of the circulating hot water has increased compared to before ； 3. The purity of acetylene has decreased (but it is free of sulfur and phosphorus, being mainly nitrogen) ； 4. The distillation tail gas is fed into the conversion reactor for further reaction. Please give me some advice. Thank you!