I am facing this problem for quite a while now. The current IOS image is: c3750-advipservicesk9-mz.122-25.SEE3.bin
The CPu util. rises to 80-90% all of a sudden then reduces unexpectedly. The interrupt utilization is always 70-80%. The process util. being low all the time.
A solitary 150Mb internet link terminates on this switch.