matthias said we shouldn't use the openstreetmap tile servers directly. I've set up a caching proxy for this. By now you can reach those proxy with (https://){a,b,c}.tiles.madavi.de. Tis will change later to {a,b,c}.tiles.luftdaten.info.
Could you test those proxy and change the the map to this, if everything is okay?
matthias said we shouldn't use the openstreetmap tile servers directly. I've set up a caching proxy for this. By now you can reach those proxy with (https://){a,b,c}.tiles.madavi.de. Tis will change later to {a,b,c}.tiles.luftdaten.info. Could you test those proxy and change the the map to this, if everything is okay?