cc @jcsteh

Steps to reproduce:

There is a way of reproducing this when using Newfon or RHVoice synth drivers
install one of the listed addons.
enter the following code in NVDA console
import synthDriverHandler; [synthDriverHandler.setSynth(synthDriverHandler.getSynth().name) for i in range(20)]

Actual behavior:

NVDA is freezing and logging lots of errors.
Player is becoming None and idle cannot be called

Expected behavior:

NVDA should be stable.

NVDA logs, crash dumps and other attachments:

System configuration

NVDA installed/portable/running from source:

Running from source, but reproduceable on 2023.3 Release version

NVDA version:

Master

Windows version:

Windows 10 22h2

Name and version of other software in use when reproducing the issue:

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Yes, 2023.3 behaves the same

If NVDA add-ons are disabled, is your problem still occurring?

Yes, but easily reproduceable with Newfon or RHVoice synth

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes