I had lock-ups and freeze ups with my 2 year old Kobo Touch. After bugging Kobo enough they replaced it free of charge with a new Kobo Glo (which I'm very pleased with).
I never really found out what the cause was, but if you look up my postings you'll see summaries of my discussions with Kobo (and others) and some of the fixes I tried. In the end after much consideration, I'm starting to believe that it was some type of memory failure that may have only manifested itself on newer firmware versions that needed more memory capacity.
Kobo Customer Care claimed they never heard of a problem like mine, but if you do some searching, you'll find out others (though not a significant number) have experienced similar problems.
My wife's Kobo Touch (same vintage, same books) never experienced this problem, and she now had a Kobo Aura that she is very pleased with.
Last edited by Joeldmtl; 01-01-2015 at 04:01 PM.
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