sonos roam does not start

I have like 4 roams 6 ones 1 play at amplifier boost and there is not a week almost not one day when one or two or all have a problem or are not working. Interrupted music. Speaker don t appear. Speaker gone from the system. Voice control react with a big delay (up to ½ day. He suddenly starts talking). Tuning is gone or suddenly the connected speaker (home cinéma) are not synchronised  etc. Without any action music start in the middle of the night. Or suddenly volume goes up or down none of the functions are reacting. I have to shut down the electricity to stop it. I m in contact with sonos support almost every week. I have another system in another flat (much cheaper) and that is working perfectly or even better. My 20 year old Bose in my studio is working 10 x better. Regret to have invested so much money for poor quality (music that is)