You could do two things:
- make sure you are a "good" version of IOS. If you are latest and greatest.. that may be the problem. For me, 12.4(24) still works fines. 15.0x may work as well, but if I would not run the latest and greatest trains as of yet.
- try popping out a DSP and see if the bad checks go away. You may have a bad DSP or slot. One way to find out is process of elimnation.
Good luck!