I am aware that both the speakers are older and require 2.4 GHZ - this is active in the router settings also the security settings are supported by Sonos.
I have tried renaming the 2.4 ghz network and connecting only to it however it made no difference.
I haven't had such issues in the past with other routers e.g. UPC or Linksys. Would be happy for any help / fix / work around.
Thank you all in advance.