My vip star ranking has went from 4 down to 2

I'm having the same problem; all of a sudden my VIP rank went from 66% of the way to 5 stars as a 4-star, to 91% of the way to 4 stars as a 3-star.

Hello TypedMedal125,

I have reviewed your purchases and your MyVIP progress is accurate. You were incorrectly receiving progress for your pre-orders on November 9th and November 23rd and many consumable purchases for Halo 5. Those were removed when we found the error, and resulted
in a decrease in MyVIP.

The same stuff is happening to me! I was at three almost going to four and now I'm too almost going into three! Let me know if anything happens on your end

Hello IStoleYourXbox1,

As mentioned in your previous post that you provided, there was no adjustment done on your account. Your progress was accurate.

Every year we perform a re-calibration on MyVIP. We use your VIP progress from the previous year (in this case September 2015-December 2016) to determine your starting rank after this re-calibration. After doing this, we place your VIP progress at a default
level.

Yes. You have to either spend the same amount or more to either maintain your rank or move up each year. If you spend less, you can drop levels.