@Marvin_S Thanks for the response. Unfortunately that doesn't help. The trouble is when a device joins the network, I get 4 notifications for the same device joining the network. Something is definitely wrong. 

That's why I want to reset the network, but I'm not sure how to and what I may lose by doing so. I would appreciate any help. 

  @Marvin_S 

I've done all those. It's different Decos rather than just 1 model. As for the notification, it's simple. You know the push notification you can enable for whenever a new device joins the network? It's that notification, but instead of just showing once, it repeats 4 times. It happens across different phones so it's not my phone playing up. 

I just want to know how to reset the network? Would I have to delete the network and then create a new one again?  Can't I do it another way as I'll lose all the history that way?

  @Marvin_S Thank you, however, can I ask what the differences would be if I manually removed every Deco on the network and set them up again, versus if I deleted the network and made a new one? 

Could there be any lingering issues from a long standing network that has had frequent new connections joined to it and then removed that could be causing performance problems by any chance? Might I see performance gains if I were to remove the network and make a new one please?

If I made a new network, while my router is in modem mode, would it be straight forward to connect the Decos back? I'm unsure what the steps would be as I would have no internet upon deleting the network, given my router would be in modem mode and the Decos would need to be reconnected

Thanks

  @Marvin_S Thank you.

Reconfiguring the Decos does not seem like a huge problem, I would only have 3 in the new setup. But would it cause any issues with my devices or otherwise if I deleted all the Decos manually from my network and then added them again? I feel like maybe I've added too many devices, even though they're offline and it is causing some problems within the Deco system, as things aren't working as strongly as they should be. Sometimes I also notice random slowdowns. 

That's why I want to reset it and start afresh. But I'm unsure on the process and what I might lose by doing this? 

Would it be better to select each Deco in the network manually and remove it, or to just remove the entire network and start again? After removing the entire network, my router will be in router mode, how would I connect the Decos back? Create a new network and then what? 

Hope the question is clear, thank you. 

  @Marvin_S Thanks. It doesn't seem to be clear on how to reset the system, and if, by doing so, I could gain any benefits or lose any features for example. 

I also wanted to clarify, it's not too many clients I have on the network, it's various different Decos. I have many different ones on the network, though only 3 are turned on while the rest are off. I wonder, if this could be causing a problem and the others should be removed? Further, I've also replaced the main Deco multiple times to test what would provide the strongest performance, and again I wonder if this could cause issues in the network leading to slowdown, even though the process was done through the app as advised.