Yes. I suspect it is a memory issue likewise, it cannot cope with some large pdfs. I suspect it doesn't use the SD card as a RAM disk and so is limited to its internal memory. I can open pdfs up to around the 22 - 25Mb but it fails on 36Mb.
It will also depend on the rendering it has to do for the document you are trying to zoom into.
On the documents I zoom, I don't have a problem below 150% zoom but do occasionally at or greater than 150%.
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