consumer rabbitmq become slower with time

[sloth2012]

My kombu version is 5.2.2, use SimpleQueue. The consumer get data with in 0.0002s/record at the beginnning, become 0.02s/record after hours, final speed is 5s/record。restart the process， it turns to be normal with 0.0002s/record. all the time just count the get data cost（with block=true）。
I debug several days，no idea what happs。now I make the process auto restart with crontab，but this is not a good way to deal with that. hope some one can help me.

In addition, I use the kombu with rabbitmq.

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