Please also let us know:

Is it always the same person who is having OOS issues?

Are members of your group using Steam or the Cross-Store multiplayer version?

What operating system are you running? (eg. Windows 10/11, Linux, MacOS)

Are you running mods?

Can this be a stickied / pinned thread for a while?

I am running into a lot of desync issues that started at the ~2320 year midgame mark. The desyncs seem to be getting worse as more stuff starts to happen. These desyncs were not as abundant in 3.x.

I noticed once after desyncing if I unpause, pause, and unpause in a quick manner, there's a chance where the desync issue will be retriggered where you need to sync again. Hopefully you guys can debug this, multiplayer is really annoying to play with this popping up so often.

There are a lot of messages like: "RANDOM COUNT DESYNC, RANDOM_FLOAT, RANDOM_NUMBER", etc, that popup
- Is it always the same person who is having OOS issues? I think so, my partner doesn't see these messages, I get them as I am hosting the match and then it kicks me to the Sync window.
- What operating system are you running? Both of us are running Windows 10 x64
- Are members of your group using Steam or the Cross-Store multiplayer version? We are both playing through Steam.
- Are you playing with mods? No mods are being used as I wanted to try a clean match on 4.x
- Have you tried playing without mods to see if it still desyncs? Yes, we are playing on a clean install without any mods.
- When in game does your game start desyncing? Halfway through around the 2300 year mark.
- Do any events happen that seem to trigger it more? The midgame threat seemed like it put a lot of load into the AI which started desynching our game. Thankfully the sync tool works pretty good and we can resume until we hit another desync after about 15-20m.
- How many people are you playing with, are they in different geographical locations?
I am playing with my partner on a hosted multiplayer game, we live in the same house.

- What are your PC specs?
Intel i7 14700k not overclocked, boosts to ~5.5Ghz from a base of 3.4 GHz
RAM: 32GB DDR5
GPU Nvidia 4070 Ti
Windows 10 Pro 10 Build 19045
Mobo: MSI B760M

My partner specs are
Core i7 12700k
RAM DDR4 16GB
GPU Nvidia 3080
Windows 10
ASUS Motherboard

Pinned as requested.

same, always OOS around 2300s,
we all have high quality PC but it just keep disconnect

Same issue as above, desync issues that started at the 2300 year midgame. The desyncs seem to be getting worse in the late game as the calculations piled up

There is messages like: "RANDOM COUNT DESYNC, RANDOM_FLOAT, COUNTY RESOURCES
- Is it always the same person who is having OOS issues? No, we load the same game in another computer but other players still desync.
- What operating system are you running? Both of us are running Windows 11 x64
- Are members of your group using Steam or the Cross-Store multiplayer version? Four of us playing through Steam.
- Are you playing with mods? one mod "limit empire size to 50" is added, but we removed it in the mid-game to check if it affects desync issue, it proves that without it, desync still occurs.
- When in game does your game start desyncing? Starts desync hard round the 2350 year mark, to the point that the game is unplayable for multiplayer.
- Do any events happen that seem to trigger it more? I think is with the new version's massive calculation with the population, resources, events, etc.
- How many people are you playing with, are they in different geographical locations?
I am playing with 4 friends, we live in the same province(CA, ON).

- What are your PC specs?
Host piece:
Intel i7 3.4 GHz
RAM: 32GB DDR5
GPU Nvidia 4070 Ti
Windows 11 Pro

My build:
Intel i7 2700KF 3.6GHz
RAM: 16GB DDR5
GPU Nvidia 4060
Windows 11 Pro

Multiplayer is unplayable at the moment for everyone. Gotta end the games fast.

yes

Our group is suffering similar issues.

Is it always the same person who is having OOS issues? - No, this could happen to any/all of us

Are members of your group using Steam or the Cross-Store multiplayer version? = All of us are using the steam version

What operating system are you running? (eg. Windows 10/11, Linux, MacOS) - All using windows 11

Are you running mods? - No mods

Other helpful info -
We typically see the issue fairly shortly after the formation of galactic council. This could merely be conincidence
We play as a group of 3 usually, sometimes 4
Once desyncs begin, they are consistent and relentless. Within months of each other
All of our players are based in the UK, though spread between england/scotland
We play other paradox games (HOI, Vicky) which don't have similar issues. We did have issues with hoi after BBA but haven't since

I am in U.S. and my friend is in China, is it impossible for us to multiplay? We have tried several times and the game just immediately freezes once we get it started (if we are even to get it started) . Is there anything we can do or change to make it work?

I also have it, i though they fixed it in one of the 21 patches...

OOS Random count, sometimes NUN missles.

2 players in same country
both on steam
after year 2300 it started, after great khan and galactic community
no mods
all DLC
windows 11 both of us

I tried to play with second account on macbook to play friends empire, same desync happens. it is always the non-host who desyncs.

sometimes the game pauses and is followed by the desync, sometimes just freezes followed by desync.

is there any workaround for the time being?

lol

hey guys in civ 5 and stellaris i got a new guide for stellaris civ 5 lover,

Desync
Ecoonomy, megastructures

We are experiencing an instantaneous (co-op) desync issue with the Arc welders Origin, so far haven't had it happen with the other ones we've tried. All e of us are playing the same empire.
I haven't tested it in non-co-op yet.

- It happens with anyone I play with
- PC specs, Ryzen 5 5600X, RTX 3070TI 32GB RAM
- Windows 10 (all of us)
- No mods
- on game start
- 3 people, all within 50Km of each other, all with borderline Gb internet.

We have had a game run smooth with minimal desync issues going on 120 ingame years now with another origin. So it seems to be that origin in particular.