play 3 keeps dropping out

You might be able to go back to the S1 firmware and App if all your gear is S1 compatible but there is no way to return to an older version of your S1/S2 firmware and app.

Have you set static/reserved IP addresses for all your Sonos, that solves a lot of regular disconnect issues that are DHCP based. You can do this from your router’s DHCP settings page, usually in only a couple minutes. Once done reboot everything and see if the daily issue goes away.

There is no Problem with my DHCP Server, I think there is a Memory Problem of the Old Sonos Play3 with the latest Firmware.
Downgrade to S1 is not an option for me, because I already have Sonos Speaker that are not compatible with S1.

To make it clear, I never said there was anything wrong with your DHCP server.

There is nothing wrong with the several different DHCP servers I have tried here either.

Still, following the advice of many other folks on the forums I went ahead and set the static addresses anyway. My problems went away with that single change.

Same here, haven't had the time or inclination to try and troubleshoot, changed nothing on my system yet my 2x play 3s have both started, in say the last 2 months, dropping out frequently. My roam, beam and 4x play ones are fine. The 2 play 5s were relegated to the garage on upgrade. Frustrating to think we're being asked to upgrade again. Hope I'm wrong

The same here, my Solution was an automatic Timer for play3 and playbar that Turn off the power every day with a smart plug.
Static IP didn’t fix the problem for me.
Really sad support from Sonos!

I am experiencing exactly the same issues with my Play:3 speakers - they keep dropping out after they’ve been running/ connected for a few hours. The only solution seems to be to power cycle the speaker and it’s ok again for a while. My system includes 2 Play:1s, 4 Play:3s and 1 Sonos Playbase.

I have tried everything (rebooting my router, factory resetting all my speakers, reserving (fixing) the IP addresses of all speakers, trying different music sources). Always the same result - the Play:3 speakers start dropping out intermittently at first and then permanently off. Until I switch them off and then on again (power cycle). Then they work ok for a few hours. The Play:1s and the SoundBase don’t seem to be affected. It seems like it might be a memory issue (cache not emptying?) and it only started happening in the last couple of months - previously everything worked perfectly - so I’m wondering if a Sonos update and caused all this?

I have owned these speakers for about 10 years, but I would not expect them to become obsolete as I have invested quite a lot in my system. I don’t want to have to upgrade if the same happens again in the future!

Duplicate post, see my response to your other post. 

I have the same problem with my Play:3.  Mine had been in storage for about a year until I reconnected it a few months ago. Worked fine until a few weeks back. It’s connected via a very close WAP which I check frequently and it shows as connected but the music just starts and stops randomly. I’ve also tried different music sources and playing through Sonos App and also Spotify App but I can’t get uninterrupted playback.  I have 6 other Sonos products in the house which all work fine - it’s just the play:3 that’s a problem

Keeping the Play 3 about three feet away from the AP might help, if it is closer they can swamp each other’s signal.

If giving it distance doesn’t help wait for the problem and submit a diagnostic and call Sonos support to have a look at the (invisible to us users) internal data.

I am a long time SONOS user and love the tech.  My only legacy piece is a PLAY 3 that is doing exactly what everyone else is describing.  It has been in the same place for 8 years and only just started dropping out in the last few months.