Hey @DHage 
Can I get approved to share relevant training data from your Calendar?
I can understand the frustration, but I think we may be getting too caught up on the FTP Prediction here than the actual FTP Detection you received :).
@LaFarrapona, if I can get approval for your account as well, what’s happening with your FTP Prediction going down is very different case to what the OP is experiencing and there is a clear explanation.
I wanted to note, that it’s important to keep in mind that is not just one workout changing the prediction, is the accumulation of the entirety of the 28 days. The Prediction is an estimation, and the Detection is the actual number you receive at the with all the training taken into consideration. They are two different things