Answer: Stressor overload
Explanation: When two have been married for ten years as Ian and Joanne, then there are many problems that have not been resolved, not all, but there are many unresolved, and new ones always appear. All these problems arise from the large number of requests made each new day and require the reaction of the married couple in response. When these reactions are perceived as problems, sometimes for real reasons, sometimes for unrealistic ones, then these demanding reactions are experienced as problems, which become larger and cause new problems. The moment when the number of these problems becomes too large, it causes a certain breaking point in the physiological and psychological aspect of human beings, which is stressor overload. Then people become vulnerable to each and every problem due to the accumulated stress, and often cannot cope with problems that were once easily resolved.