I was Tower and Ground at EHAM on Training.
Suddenly I lost all aircraft on both frequencies.
When I logged out and back in after a while, I got them back, but then aircraft started disappear one by one.
The aircraft I saw on Ground weren’t there on Tower.
I don’t have Internet issues.
The aircraft disappearing one by one makes it look like there’s some other traffice issue or server issue.
Earlier I saw an aircraft that was at the gate starting to float upward, then down again and even through the ground, before disappearing as well.