LRc in Develop mode freezing whole PC every 30-60 min

Hello Lightroom folks,

I got a problem with my Lightroom. When im developing RAWs, every 30-60 minutes my whole windows freezes. At first, i can still move the mouse, but after a few seconds also this is not possible anymore. I can not go into Taskmanager or click anything, i have to brute force reset the PC.

I think it only happens once I applied masks to several images. But its not really reproducible. I had that freezing issues also with the last 2-3 Lightroom versions, so its not limited to the newest one.

I do not observe any overheating (CPU stays <70°C and GPU <60°C). I also do not observe these crashes while doing anything else than LR (gaming, surfing etc).

My hardware:

Windows 10

Ryzen R9 5900x (at 110W PPT)

64 GB DDR4-3600 RAM (Corsair Vengeance LPX 18-22-22-48, 2 x 32 GB kit)

RTX 3080 undervolted to 0,775 V

LR (13.5.1) running on one SSD (Kingstom A2000 2 Tb), while all images and the catalog is running on a seperate NVME SSD (Lexar NM790 4 TB).

My workflow is usually:

import cRAWs from Canon R7 (or sometimes raws from Panasonic Lumix T101) to the Lexar ssd --> apply some sharpening/masking --> AI denoise to different degrees (nearly every image gets denoised) --> basic adjustments --> masking

What i've already tried:

- Tried running the RAM without XMP mode, since I upgraded that RAM some months ago from a 32 Gb Kit and im not really sure if I had that problem before the upgrade

Im currently testing the GPU without undervolting.

What else can I do to fix that problem?

Thanks