Hi Wozzzaaa, welcome to MobilRead.
Perhaps some of your problems with your reader are both time related (battery life will improve after a few chargings) and
specific book related (Both crashing and losing bookmarks) I sometimes have this same problem with some pdf files in my Sony. Other pdf files read though just fine.
Let's hope that all your problems resolve themselves either though time or firmware upgrades. E-books can be such a delight... when everything is working correctly!
Stitchawl