Having installed a 3 system Deco 5 it appears Deco is having a negative impact on internet speeds both hard wired and wifi.

Sep up - Main Deco connected via ethernet to ASUS router with wifi turned off. 2 other Deco satellites connected to main Deco via wifi.

Initially internet speed for both hard wired and wifi 25Mb/s which is max for my current supply.

After a few days noticed speed had dropped to 2Mb/s for both wifi and hard wired.  Disconnected main Deco rebooted; speed increased to 15Mb/s immediately back to 25Mb/s after 24 hours.

Having checked over last few days only getting 14-15 Mb/s both hard wired and wifi. No changes to set up or additional devices connected to system.

Disconnected, rebooted but no improvement.

Deco set to router and latest firmware installed, QoS cleared, no settings or priorities.

Not sure what problem could be, but if continues will need to send back as not doing the job it was bought for.

Any help gratefully received.