FLARM statistics on the facts page

As we are continuing to integrate FLARM into the network we have just updated our facts page.

I have a question in relation to FLARM.

I am a member of a glider club in the Netherlands. To prevent collisions between gliders and other aircraft I have created a monitoring system using opensky.
Last year in November (2018/11/03) I could see every glider. The club feeds FLARM to OGN or anyone who is interested in receiving data.
Today I was no longer seeing airplanes with FLARM nor did I see mode-S messages.
The area around 52.904165,5.010655 shows up on the network coverage map as 'well covered', a dark red circle.

The questions that I have are these:
1. Did anything change in respect to FLARM?
2. Is there anything I can do to improve the situation?

We are extremely happy with OpenSky!
The API's are well documented and easy to use.

So we are eager to work with you should we need to add a data feed.