I'm running into the same issue. I have ~2200 files (~50 gigs) that I'm trying to run through. Eventually, Affinity Photo locks up. I kill Affinity photo, restart it, requeue the files that haven't been processed yet, and restart the batch processing with the unprocessed files. Eventually...it hangs again.
Details:
Affinity Photo 1.8.3.641
Parallel processing is OFF
Batch process is simply to open an NEF (Nikon Raw), apply auto levels, auto contrast, auto colors, auto white balance, then export to jpeg resizing to 1/2 of the original size on its longest axis. Each NEF is 5600x3728, 14 bit lossless compressed raw, typically 20-25 megs. JPEG settings are resampling: Lanczos 3 Non-separable, quality 85, embed metadata is not checked.
Typically somewhere between 200 and 300 files will complete before Affinity Photo becomes unresponsive and I need to end the task.
Running Windows 10 Pro 64 bit, on an i9-9900K with 64 gigs of RAM and 1 gig of swap.
Additional information:
crashpad_handler.exe seems to stop working simultaneously with Affinity Photo going down.
Description
Faulting Application Path: C:\Program Files\Affinity\Photo\crashpad_handler.exe
Problem signature
Problem Event Name: BEX64
Application Name: crashpad_handler.exe
Application Version: 0.0.0.0
Application Timestamp: 5e8324cd
Fault Module Name: ucrtbase.dll
Fault Module Version: 10.0.18362.815
Fault Module Timestamp: 32a6df9a
Exception Offset: 000000000006db9e
Exception Code: c0000409
Exception Data: 0000000000000007
OS Version: 10.0.18363.2.0.0.256.48
Locale ID: 1033
Additional Information 1: c9aa
Additional Information 2: c9aa7345478c2e0fac34248b68b6b065
Additional Information 3: 4cc9
Additional Information 4: 4cc9b239491bd086e60de990da5864e2