Hello. I have 3x Deco M4. They are set-up and working well with my Vodafone router. Currently they are connected via wifi only, but the signal isn't strong enough around all parts of the house. Previously they were connected to ethernet points, which are served by a network switch. However, the Deco network won't work if there is any connection to that network switch and the ethernet points - so i think there is a problem with that Switch (it isn't a Tp-link product).
 

Do I need to buy a new network switch in order to fix this issue? If so, can anyone advise on which TP-link switch would be most suited for this. The set-up I would use would be Vodafone router -> connected to main deco (M4) -> Connected into the network switch -> then 2x other Deco M4s PLUS 3x desktop iMacs connected to ethernet ports around the house.

I was looking at this model: TL-SG1008MP - as it is in my price range, and has the required number of gigabit ports.

Appreciate any advice on this. It's all very new to me so I'm struggling a bit!!

Thanks.