Xiaomi Smart Air Purifier 4 Weird Smell Like Rot and Garbage

I purchased the Xiaomi Smart Air Purifier 4 in March, and initially, it met our expectations in terms of performance. However, things took a turn for the worse when it started emitting an unpleasant odor resembling rot and garbage. Despite my diligent efforts to clean the filter regularly, the smell persisted and even intensified over time. The current state is so unbearable that I cannot use the air purifier anymore. What's baffling is that the filter is only at 68%, and I'm now forced to purchase a new filter prematurely due to this issue.