I have two PW5 (one regular, one signature - not that it matters). Regular one has WiFi always on, signature is almost always off. Several times after I turned on WiFi to receive content from Amazon (every time I bought something) sync will delete all sideloaded books from the device. In all cases clock was somewhat out of sync on the device (DST, drift, etc). To me it looks like a software bug and not an intentional action, because second device (which has no purchased content - only sideloaded books and WiFi always on) never had any issues like that.
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