There’s a problem with the regenerator; what’s going on here?

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Dear experts: This device is a 3.5-generation UOP reformer for continuous reforming and regeneration. It seems that there is some issue with the regenerator at the moment; it appears that there is some blockage in the internal network. Specifically, the normal peak temperature of the regenerator is found in the fourth bed layer. Starting at 9:50 on March 11th, the amount of air used for combustion was gradually reduced by 10 Nm3/h. After the temperature in the fifth bed layer of the regenerator rose to 490°C (and continued to rise), the oxygen content in the regenerator decreased by 0.1%, while the temperature in the second bed layer dropped by 10°C. At 12:11, after increasing the air volume again, the oxygen content in the regenerator remained practically unchanged until 13:26; meanwhile, the temperature of the fifth layer of the regenerator bed increased by slightly 1°C. During these 1 hour, the air volume was increased, but the oxygen content did not rise; the temperature of the fifth layer in the regenerator bed did not decrease. After 1 hour, the temperature of the second layer increased while the temperature of the fifth layer decreased. What does this indicate?