Fritz network issues

[Cat Drummond]

Hi all
So I had a network comprising a Fritzbox 7530 as the main mesh master and two FritzRepeater 3000s working perfectly in the house.
We have had an outhouse built at the end of the garden and so I have run a LAN cable from one of the repeaters down to the outhouse, which is connected to another Fritzbox 7530 set up as a mesh repeater, and another FritzRepeater which is connected via Wi-Fi to the second Fritzbox in the outhouse.
Ever since I added the outhouse:
1) one of the repeaters in the house refuses to mesh - it is connected via Wi-Fi but isn’t meshed (have tried the usual fixes)
2) internet via wifi in the house stops working all the time. So for example my phone will say it’s connected to wifi but not browse. What is weird is that the wifi in the outhouse appears to be unaffected as 2 ring security cameras appear to be connected without any issues.
I have tried rebooting the main mesh masher many times. Usually the internet over wifi in the house works for a couple of minutes and then stops again.
Any thoughts gratefully appreciated!

 

[Cat Drummond]

Thanks !bluetonic!.
Do you have any specific ideas as to what I can do?
For me, I don’t think it’s a firmware issue as it coincided with me adding boxes to the system.
But not having wifi is driving me slightly nuts!
In addition, unsure on the 5 ghz vs 2.4 thing for my setup as I’ve got up this morning and I can’t even log my phone into the box itself via its IP address (which I don’t think should need internet, should it)?