A manufacturing company's DCS that stored all the production process data had a hardware failure. The hard drive crashed and they didn't have a proper off - site backup. So, years of production data including quality control metrics, machine settings for optimal production, etc. were lost. This set their production improvement efforts back a great deal as they had to start from scratch in analyzing their processes.
Sure. In one case, a company had a DCS for its inventory management. Due to a software glitch in the DCS, all the data about the stock levels got erased. This led to chaos as they had no idea what items were in stock, what needed to be reordered, and it took weeks to recover the data and get the system back to normal.