I am a happy new Sonos owner.  I haven’t been able to find an exact answer to this in the various topics. 

After power is lost to a speaker, does Trueplay need to be run again?  

The reason I ask is that one of my speakers is on the same outlet as a timed lighting circuit.  This circuit goes on and off once per day.  I am waiting for the electrician to split the outlet so that one half is always on.  That will also solve the problem of the speaker falling out of its group every day.