ST2 crashes near end of creating thumbnails

When I edit an image, I let ST2 create thumnails for all the Looks. I scroll down at intervals and it takes many minutes. However just before it is completed, ST2 suddenly vanishes.

Faulting application name: Topaz Studio 2.exe, version:, time stamp: 0x5e615c0a
Faulting module name: Qt5Gui.dll, version:, time stamp: 0x5d6a3409
Exception code: 0xc0000005
Fault offset: 0x00000000002c2c76
Faulting process ID: 0x2350
Faulting application start time: 0x01d66b0be3e04557
Faulting application path: C:\Program Files\Topaz Labs LLC\Topaz Studio 2\Topaz Studio 2.exe
Faulting module path: C:\Program Files\Topaz Labs LLC\Topaz Studio 2\Qt5Gui.dll
Report ID: 884f7fba-11fd-405c-8d88-b629c6efcaff
Faulting package full name:
Faulting package-relative application ID:

Application & Version: Topaz Studio 2 Version 2.3.1

Operating System: Windows 10 (10.0)

Graphics Hardware: Radeon RX 570 Series

OpenGL Driver: 3.3.13587 Core Profile Forward-Compatible Context 20.4.2 26.20.15029.27017

CPU RAM: 16236 MB

Video RAM: 4096 MB Total, 4059 MB In Use

Preview Limit: 7112 Pixels

The problem looks like the C++ dll but may be lack of resources as Task Manager shows both CPU and RAM maxed out. CPU i7 4500 and 16Gb RAM

Raise a support request at the main website please.