Slay the Spire 2 Multiplayer Disconnects — Why You Keep Losing the Host

Getting dumped from co-op runs every twenty minutes is the most reported multiplayer issue in Early Access — and the cause is usually the least satisfying answer in tech support: Steam's servers are overloaded. The game's population spikes regularly, and relay stability suffers at peak hours. Here is what actually helps, and what to rule out first.

First: rule out your own network

Before blaming the servers, clear the local suspects:

• Go wired. Wi-Fi (especially 2.4 GHz) is the top cause of "random" disconnects that only look like server problems.
• Reboot the router — a stale NAT table drops long-lived game sessions.
• Close bandwidth hogs: streaming, downloads and cloud sync on anyone's machine in the house.
• Check the host first. If the host's connection hiccups, the whole lobby dissolves — the host needs the stable line, not the guests. See how hosting works.

The server-load reality

At peak hours the relay infrastructure genuinely drops parties. The signatures: disconnects cluster in evening peaks, everyone in the lobby drops at once rather than one player stuttering out, and retrying immediately fails the same way. The fixes are unglamorous:

• Play off-peak. Moving the session a few hours (or to a weekend morning) dodges most relay congestion.
• Retry the lobby. A fresh host migration often lands on a healthier relay.
• Wait for the patch. Server capacity has been a recurring item in patch notes; peak-hour stability improves in waves.

The advanced workaround: LAN-style play

Groups who need stable long sessions sometimes route the game through a LAN multiplayer mod plus a tunneling tool (the kind used to play LAN-only games over the internet). It works — direct connections skip the crowded relays entirely — but setup is genuinely technical, and every player needs the same mod set. Only worth it for regular four-player groups who keep losing Sunday nights to the servers.

If single-player also disconnects

Cloud-save sync errors and login loops are a different beast — check Steam's service status, verify game files, and see the launch fixes. But when the game itself runs fine and only co-op drops: it's the servers, and the spire will still be there in the morning.

Keep reading:

• How to Join Multiplayer
• Stutter and Performance Fixes
• System Requirements