I've read several posts about the Play 5_2nd Gen suddenly having problems due to a defective WiFi card. Although it appears that Sonos has been replacing the defective units (when notified) it still gives me pause. Do I need to be concerned about my two (2) out of warranty Play 5 2nd Gen's developing the same issue? If it is widespread I would hope that Sonos would issue a re-call to replace the units similar to what Microsoft did with the 1st Gen Xbox One units manufactured in a certain lot. Can anyone at Sonos elaborate?