Great response many thanks.
I will be happy to receive this unofficial manual so if you could send it to me that would be fab.
I have left my router running since last night and will be testing it with devices already connected.
Also I noticed that if a device which is connected to LAN but it isn`t listed under DHCP , when I copy their MAC address and paste in DHCP section and then type in IP address follow by Apply button it seems to allocate it correctly. So you are probably right about the software bug but I can leave with that if its still works.
Let me know what is the max limit , some of my device are just smart bulbs and switches so there isn`t much traffic from them comparing to phone or tablet.
Just to let you all know, we have passed this to the products team to look at.
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This is a well-known bug, which is awaiting a fix, hopefully, although I have had no confirmation, this will be in the next version when that is released (I have no date for this).
I am not employed by TalkTalk, I'm just a customer. If my post has fixed the issue, please mark it as the Best Answer.
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Just to advise, our Products Team have tested connecting 30 devices and not experienced any issues. Have you tried a full factory reset and then retested this again? If you've already tried this then we can send a replacement router for testing purposes.