Thank you, almost perfect. The information screenshot both times show the 5G setup… but anyway let’s see what we have here
So as we can see the handshaking was successful. The network connection at the time was properly established. Signal reception looks ok too. You are using the most common encryption type WPA2 with AES. Nothing to do here.
5GHz frequency looks ok, no overlap and you don’t face any troubles with it.
Generally spoken, the cause of your problem must not necessarily be your router but another one (different network) interfering. You can only reconfigure your 2,4GHz network which hopefully solves the problems.
Looking at the 2,4GHz frequency there are others, but they are far apart. Yours do fully overlap with the yellow. This looks a bit strange anyway.
All the others, even on my screenshot are using ~4 channels. The yellow network is spread over ~8 channels and even has a stronger signal than yours, which is not very common. So there is not much room to spread.
One side story here: I knew people who encountered massive problems with their handsets using 2,4GHz wifi at home. They also used an analyzing tool and found one signal spread over the entire range from channel 1 to 13 and it was strong although obviously from another neighbor. The network name sounded like some type of high-class industrial wifi access point, nothing ordinary. And it seem to pump with 100% signal strenght. So many other neighbors had troubles with their common Netgear, Fritzbox, DLink etc. APs to get their wifi reliable up at home having only limited signal strenght and reception.
As this neighbor was no renter but apartment owner he did not open the door for anyone. So no one could do much about it.
In your case this yellow network does not look like a standard setup. This may be the culprit causing interference with your 2,4GHz connection. I once gave you a link in a previous reply to an online setup guide for your specific Ubee AP and I have read some more into it (also a Belgian manual and screenshots of the interface can be downloaded here if you are missing them), specifically the wifi channels part.
It is commonly recommended to use one of the channels 1,6,11, but mostly as a standard setup the auto mode is active and no one can tell where you will end up. This is fine, as long as you don’t have troubles which is not the case for you.
Manual switching then is necessary (it can only become better). Furthermore it is then advised to:
Before changing anything on your routers setup, please use it’s configuration backup option!
Now you could try out channel 1 or 13, maybe this solves your problem already.
If not, as it slightly shimmers through the 2,4GHz label you are on channel 8 (the 2,4GHz information screen is missing here). To fully overlap with the yellow network switch to channel 6. If this also does not help at last the channels 3 or 11 could be tried.
No one can tell for sure how this yellow network is setup. What I can see it’s the only one using 40MHz, not 20/80Mz which is a special mode not very often used. It’s a DrayTec device which is using the 40MHz mode to improve performance by logically using more than one channel at once. If it’s not installed in your household it seems to be a nearby neighbor also not having limited his signal strength to his living space.
This could explain why both other 2,4GHz networks are spread to the fullest using channel 1 & 13.
While I was reading through some relevant chapters of the online guide (mainly by examining screenshots) and found you could also go through the wifi chapters and compare the 2,4GHz settings with the 5GHz settings. Many options should be equal.
I am a bit impressed by the features and all these available configuration options, pew. Rather something for network specialists.
In the part “Wireless2.4GHzRadio”
I could find the network band option.
In the part “Wireless2.4GHzAdvanced”
I could not find the option for the specific wifi band (802.11b/g/n/ac/…) it may use. I could only find keywords such as 802.11b Only --> XPress™ Technology Disabled Enabled 802.11n Protection Auto Off
According to the wifi standard wiki the b mode is one of the oldest and should be avoided for the reasons mentioned above (from the same wiki page).
If this so called Xpress mode means 802.11b mode better disable it for 2,4GHz and see how things are going.
At last since there is a backup option for your settings there may be a firmware update available at www.ziggo.nl/software.
This could also help if nothing else did by now.
Hopefully with all of this you are able to tackle down this curious problem on the 2,4GHz side.