I have had my Sonos system up and running with no trouble for 3 years or so.  My system consists of 4 Play 1 speakers, a single One speaker, 2 Connects with a Sonance amp driving  in ceiling speakers throughout the house and one Connect through a Denon receiver driving my television room.  All of a sudden then Play 1/ One speaker are not even close to in sync with the Connects.  The One speaker required an update which I did and the problem seemed solved.  Today I tried to play music and it is all out of sync again.  Anyone have any thoughts on how to solve this?  I checked for other updates and everything is fine.  I pretty much only ever stream iTunes music through them.