Here's the scenario. Your work assignment, sales territory, etc changes dramatically for the worst yet you are told output must remain constant.
Within months you are given a PIP that cannot be achieved and given the choice of quitting immediately with 30 days pay and 90 days of benefits, or, you can stay under the impossible work plan and be fired at ANY point in the plan without severance or benefits if it appears you are not progressing. I mention this because a wise person would shift 99% of their effort to finding a new job when their assignment changes.
I was not wise and I paid the price.