For the last week or so my Deco P9 keeps dropping connection and when connected the download speed varies greatly from 2mbps to my normal speed of 45mbps. I have hardwired to my ISP router and the speeds are constant and have no issues, which implies the issues are with the Deco units. 

I have tried changing the Deco's from router mode to Access Point and the issues are still occurring (i also have fast roaming turned off as this seems to be the answer to most queries). I had no issues up till last week and everything was working fine for the last few months.

I am not very technical but does anyone have any ideas what i could try? As currently i only have 3 expensive paper weights.

Many thanks