Please help, I'm a non techie, so besides changing password for my router its almost default config

I have a Sonos smart speaker (ONE) and when I used it with my SKY router I've had no issues, since installing my new Archer VR400 router, my wifi connection at the back of the house if weak, and this is where my Sonos is, as such I've purchased TP Link powerline adaptors (AV600) I have 3 of these. two at the back of the house,

My laptop connects to one of these Powerlines and I have TEAMs calls all day, no issue, One in my kitchen where my Sonos is and one in my attic room where I run Netflix on my Smart TV, with no issue. the one in the kitchen has been fully tested by hooking up a laptop, phone, Smart TV. all with no issue (I only connected these devices as a test, otherwise nothing connects to this adaptor in the kitchen unless I go in there with my phone)

I've added the SSID and Passwords to be the same as the router and across all adaptors and I've done a walk though test with my mobile device and as my wifi gets weaker it automatically connects to the next Powerline adaptor

However it appears that My Sonos wont connect via a Powerline adaptor, If I move my Sonos to be in range of the router it will connect and stream my playlist all day long (just yesterday I streamed for more than 5 hours non stop)

When I move my Sonos back to the kitchen where the wifi is weak, it streams for approximately 15 mins or 7 songs and then disconnects from the wifi and I have to switch the speaker on and off for it to reconnect, only for the same to happen 15/20mins later. So from a process of elimination, the Sonos is not seeing the Powerline and instead its hooking onto the weak wifi signal and then intermittently dropping the connection

I've also noticed that 5g is not available via the Powerlines, so I cant connect via that.

Lastly, not sure if this is related, but about once a week, both my Wife’s and my phone, wont connect to wifi and we have to switch wifi off and on and then we start to get messages through, (We get the full wifi logo at the top of the phone with an exclamation mark next to it)

When I've been testing Sonos in the kitchen, I've tested when there are no fridges, washing machines, boiler or any other devices that may cause a load and I get the same issue, I've also tested whilst the white good are on and still get the same results

These powerlines are all on the same electrical circuit, plugging direct into the electric wall sockets and not using any electric extender leads/adaptors 

I know this is a long message, but I think this is probably an easy config fix, and I would feel competent to apply it, I just don’t know what to apply

Lastly, as my Powerline has ethernet connections and my Sonos also has ethernet, I've hardwired that into the kitchen powerline adaptor and I still have the same issues, I'm convinced that the Sonos is not seeing the Powerline wifi

Rareley I get a message on my laptop saying "wifi connected without any internet) and I disconnect and reconnect, I think this could be related to the phone issue, but I often reboot my laptop, rather than leaving it running, Its almost as if every so ofeten the Wifi is dropping and reconnecting and my phones and laptop can not handle the reconnection. However this is definately a different issue to the Sons

Thanks in advance for your assistance 

Regards -  John-Boy