unable to connect

Hi I,ve had sonos for years always had the usual problems, buffering etc. I thoght I had sorted this with a Boost which worked great for a few months, but now every time I go to put it on I have connect again to wifi, always the same message, sonos not detected on your wifi. I do all the usual stuff reset app works fine then I leave for work come back try to put it on same message again sonos not found on you wifi. Any ideas. Thanks