I have a few large PDF's on my PC which I want to transfer to my iPad 1 and read. Ideally I'd like to use iBooks to read them, but this app doesn't seem to support file sharing, so I tried downloading and installing PDF Reader Lite. I managed to install it in iTunes, then synced to the iPad and managed to copy 3 PDFs to this app on the iPad (about 150Mb each). When I tried to open any of the PDFs in PDF Reader Lite the screen went blank for a couple of seconds then bounced me back to the homescreen. So I uninstalled PDF Reader Lite and tried to search for other PDF apps on the App Store directly on the iPad. I typed something into the Search box, some search results started to be displayed,then I get bounced back to the home screen. I've tried this 10 times and exactly the same thing happens - the App Store won't stay open for more than a few seconds - it gets automatically closed and I get returned to the home screen. Could it be that the iPad is short of memory? If so, how could I tell, and what can I do about it? Can anyone advise what to try next?