For the last weeks my CTL is gradually declining, although my training load is fairly consistent ij the last month(s). There were some extra days off, but none of these should contribute the decline of both the CTL and upper- and lower bands of the productive zone. The ALT (acute load) is consistent for the last 27 days, coming from a lower volume during the holiday. My average load of around 850 is now reported as "very high" with a load ratio of 2. 
Today the drift becomes even more significant, the CTL and bandwith at the lowest point is has ever been in the last several, monthts. even after the lightest day fell out of the 28-day moving average.
My fitness is increasing, as is my lactate threshold and vo2max. But no huge steps that might explain this. Anybody else noticing a similar pattern?
