I'm using Authorize dot Net's SIM api to process CCs. I'm also using ZC 1.3.8a (I know I know). The problem is that in the last 3 days we suddenly started getting multiple charges for the same order. Sometimes they're separated by up to 8 hrs. One of the orders that this happened too (chartge 6 times in this case!) Is missing from Zen-cart all together.

Any ideas on this?