Ok for future reference I figured the problem out.. or at least.. AI did ;)

Root Cause (final)

AntService.exe crashes because WMI event subscriptions are broken on your system

Specifically:

• AntService tries to create a WMI watcher for Win32_PnPEntity

• WMI throws WBEM_E_INVALID_CLASS

• AntService doesn’t catch the exception

• .NET aborts the process

• Tacx shuts down seconds later

This is 100% deterministic and reproducible.

Why reinstalling Tacx alone does NOT fix it

• Tacx ships AntService as a packaged Windows App

• The crash happens before any Tacx code can recover

• The problem is in Windows WMI, not the app

That’s why:

• Reinstalls don’t help

• Driver updates alone don’t help

• Tacx closes “mysteriously”

 Correct Fix (Do This — In Order)

1️⃣ Repair WMI (mandatory)

Open Command Prompt as Administrator:

If it says inconsistent (likely):

Reboot.

2️⃣ If AntService still crashes → reset WMI

Reboot again.

️ This is safe and commonly used by Microsoft support.

3️⃣ Rebuild WMI performance counters (often required on Win 11 24H2)

Then:

Reboot.