Apps like eBook readers, podcast clients, offline mapping programs and even Apple's own iBooks app (as long as Apple is following its own rules) would have its cached data wiped clean if ever the device runs low on space.
Hit the link below for Arment's detailed explanation of the problem.
Source: Marco Arment
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Andrew Wray is a Salt Lake City, Utah based writer who focuses on news, how-tos, and jailbreak. Andrew also enjoys running, spending time with his daughter, and jamming out on his guitar. He works in a management position for Unisys Technical Services, a subsidiary of Unisys Corporation.