Just saw this and thought I’d link my post since I am having a similar issue-- not exactly the same error message, but I wonder if it’s related. My entire resources folder is only 58MB but there are around 2,000 short .mp3 files, and file loading is inconsistent for me, even on the same machine and same location.
I also found this other thread that loaded 800MB of data spread over 400 images, which was slow but seemingly successful.
Is there currently a recommended limit to file size/number?