I had this problem at a client where we were importing Purchase Orders.

There were a couple of statistic triggers running off the POs that weren't actually required by the customer so we switched them off.

It appeared that the statistics updates could not keep up with the PO updates

Yours appears to be to do with Sales. If you don't require them then switch it off

My recomendation is to not use STATS in real time I prefer to use batch.