Update: I downloaded some free ebooks from BN; the 600+ epubs I sideloaded with Calibre disappeared from the library list and haven't come back. I currently have about a hundred titles on it now, and it seems stable.
My feeling is the Glowlight 3 just can't handle updating the library database file with too many sideloaded epubs. A definite limitation, but 100 is still more than enough to read for now. Don't know if it's a hardware or operating system problem. I doubt if there's anything Calibre could do, but I haven't tried sideloading without Calibre.
Fyi.
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