I have 3 Decos connected wirelessly . the Rooter is a Business Smart 3 . Model number of the new rooter BT Smart hub 3 F5394-CP BT My real questyion with this rooter should i upgrade to newer Decos...

I have bought a new router which has a signal of 5.3 GHz most of the Deco boosters work but the top floor one fails to pick up. Is there a problem with this arrangement? Is it a problem because the...