As always thanks you both for the help, explanations.
@tomvdhorst you are right no problems yesterday, buit I guess this makes it even more weirder.
It looks like my “regular” graphs.
here my 7 day’s
Walked around but did not see something different.
Will try to use my laptop as suggested to find the “source” as suggested by you guys.
What I see and don’t understand the huge min/max differences
The min/max differences originate from the issues you had earlier, it tries to predict the expected traffic and since that was quite low on friday and saturday between 17:00 and 04:30 it drops there to the level you had on those 2 days. On the other times it follows your “normal” traffic pattern since you had no interference in that timeframe.
@tomvdhorst
Thank you for the explanation. Learning every day 
It’s min / max for the preceding 7 days.
I suppose that could use a legend change.
Seems that the drops are starting on Friday and continue today. The rest of the week there are no drops at 16:30 hrs.
Walked around could not see an antenna or anything. At home nothing changed, so it must be something from “outside”
Seems somebody is doing something nearby 
weekend activity ? Curious to see is this is dropping again tomorrow then you might have a pattern.
It looks like you are right. Yesterday there was no drop in messages or in planes seen. only on Friday and Saturday
Maybe someone is broadcasting in the weekend ( Etherpiraat ? ) you should check with an analyser when you are able 
Downloaded the Cubic software, you suggested. Will now trying to figure how to use it in a way that even I can understand.
I also tried to find an analyser for the Airspy that I can use on a Mac, but could not find it.
I studied the graphs again and it looks like that it went on the whole night in Saturday
I don’t have an Airspy so I don’t know how to use that for the analysis.
If you look at the link provided earlier there is also an how to do that with the software.
You should measure when the interference is happening otherwise it won’t be visible.
OK will do that, thanks for all the explanations
If its anything like here. The new 5g towers cause a huge spread when doing download tests visible on spectrum
Weekends being more people home and not at place of business and doing more surfing/streaming than normal.
Hi all,
yesterday I noticed another weird thing. I had a drop in my messages (other than the weekend drop on Friday and Saturday 16:15). But I also noticed a huge number in the ads-b tracks seenseen graph. Could this be related?
Here the graphs
It’s been discussed a couple times on this forum what the tracks graph means.
Every time you see “new” aircraft, it goes up. Now if you lose lots of aircraft and then … when they come back.
Thank you for the reply. I am aware of that.
But I am curious if the high number is coincidental with the drop in messages as it was at the same tome. The high numbers and the drop in messages.
You’re missing the point.
Once the interference stops, that’s when the tracks spike.
Thank you for the explanation. Did not know this
I was able to find a RTL- SDR dongle and as said I downloaded the CubicSDR. Guess you are working with that one as well. Would it be possible for you to send me screenshot of the settings and what to select, as I have absolute no idea what to do and what to look for.
Sorry for troubling you 
After I openend CubicSDR I see this:
Sorry, you guessed wrong, I dont use Cubic SDR since I don’t use any Apple devices.
I can share the settings that I have for my Windows setup latere tonight but can’t provide you with the exact Apple application input.
Thank you for the reply. and I would appreciate your screenshots. Perhaps I will be able to use the same settings ( more or less)
