Well, this one did reset while formatting a book, but it didn't wipe out anything when it came back. It also got stuck on a page while trying to resize font, I waited patiently for it to resolve but nothing happened after 5 minutes. I just went back to menu and switched off as before but when I switched on it had not lost collections or bookmarks so it seems much better at holding on to stuff than the last unit, that one kept wiping out stuff.
It has only reset once in three days, so I think this is much more stable.
I did find that if I place a MS in the reader and attach reader to PC and transfer book to MS while in reader via eBook Library that the books all format on opening BUT if I place the MS directly in my card reader slot in PC and then open eBook Library it still sees the MS so I can create collections still and if I transfer that way the books on the MS don't format..............it seems more stable transferring directly from eBook Library to MS in PC rather than to MS in reader itself.............not sure why but it's works better for me.
eLibrary is more stable with this second unit too. The first unit seemed to cause eBook Library to hang for a minute or so at a time, sometimes freezing it completely. This one seems fine, just the odd 2 second hang then fine again
It seems that the odd reset is normal, just not as many as I was getting before.
Anyway, LOVING my reader now, finally getting to read some books on it, instead of problem solving issues. Fun at last.
Thanks to everyone for their advice and guidance, I have learned a lot about my reader and how to help solve a few issues along the way, so I won't panic as much next time I hit an issue.