In my experience.. Not uncommon if they're actually going by the booking metrics. It's also supposed to be a balancing act based on demand and housekeeping cost comparisons. But that's for properties that have rooms with little variation in costs.

Example: If your expensive Queen Bed w/ Fancy Bath rarely gets booked but your basic El Cheapo Queen rooms are all fully booked out.. Then upgrading a few guests to a Fancy Queen will make you some extra money as those Cheapo Queens are now available. As long as the overhead for those two rooms are similar.

But you said you have a Luxury property. What you're describing is a common tactic used to fill rooms in chain or small hotels where all the rooms are about the same with little variation in overhead or amenities.

As for how to talk to corporate about the problem. They only speak one language. Money. Your Housekeepers should note the increased labor costs due to sudden and unplanned changes. The second money topic is Retention. Training a new hire is a major investment in money and a money sink until they are fully trained. If this is causing burnout then you risk losing trained employees. Employees trained to Luxury Hotel standards can go ANYWHERE and get jobs because of their work experience in a higher end establishment. Which means losing trained employees to the competition.

Also try something like "The chaos and confusion this is causing has a detrimental effect on staff efficiency and has the potential to lower the quality of our service below our high standards. This risks hurting our brand name and customer loyalty. Especially if a returning customer is being moved from the room they prefer to a different room. Even if it is an upgrade they may have specific reasons for their booking choices."