Home Assistant 2025.9.0 and Later - System Instability and Frequent Restarts

[Sir_Goodenough ((SG) WhatAreWeFixing.Today)]

Then not a raspi which I was predicting in my head.
I would see if this helps you find something then.

2024.5+: Tracking down instability issues caused by integrations

If your system is unstable due to a misbehaving integration, there are several ways to identify and recover from the issue. It’s recommended to enable Home Assistant’s debug mode and asyncio debug mode to collect detailed logs and diagnose the root cause. Using Home Assistant's Built-In Debug Mode (2024.5.x or later – Recommended) Enabling Asyncio Debug Mode at Runtime (Preferred with Debug Mode) Enabling Asyncio Debug Before Startup (Fallback Plan) 🛠️ Manually Enabling Safe Mod…