I don’t know if there is a relation but after @obj restarted the MLAT server in the EU region ( If I understood correctly) I saw an increase in positions.
See this post Problem with MLAT? - #7 by triggers
That restart brought the number of positions back to normal
After I had to reboot some receivers last friday they returned to the lower values again.
The number of aircraft remains the same on average, but the postions really fluctuate.
As said, this is an assumption but It looks like the serverside issue is still there.
I can’t explain why the number of positions has dropped to a 1/3 of the previous days.
And yes I do use Skyaware Anywhere permanently, I have a display of the radarview from an Intel Nuc on a screen.