After updating to Razer Synapse 4, my internet connection started dropping for ~30 seconds approximately once per hour. Other devices on the same router (Wi-Fi) worked fine during the drops, confirming the issue is on the PC side.
After extensive diagnostics using Windows event logs, I identified the root cause:
The following Razer services spam the Windows network stack with hundreds of "hostname changed" events every minute, which eventually causes the connection to drop:
- Razer Chroma SDK Server
- Razer Chroma SDK Service
- Razer Chroma Stream Server
- Razer Game Manager Service 3
EVIDENCE:
With Razer services running (April 23, 2026):
Windows event log Microsoft-Windows-NetworkProfile/Operational showed dozens of Event ID 4004 firing every single minute — hundreds per hour, all with "hostname changed: true".
With Razer services stopped (April 26-27, 2026):
Only ~40 events over two full days, all corresponding to normal PC boot cycles. Zero unexplained network disturbances.
Confirmed disconnection events (Event ID 10001 → 10000):
- April 22, 20:41 → reconnected 20:42
- April 23, 11:35 → reconnected 11:41
- April 23, 13:23 → reconnected 13:24
WORKAROUND:
Disabling these four services completely resolves the issue. Internet has been stable for several days since.
ENVIRONMENT:
- Razer Synapse 4 version: 4.0.86.2604140749
- OS: Windows 10
- Network adapter: Realtek Gaming 2.5GbE Family Controller
- Connection: Ethernet (wired)
- Razer device: Razer Viper V2 Pro Wireless White