Hi mey_500
I personally would try those things.
- remove memory card[s] and see if the problem remains
- if you still have problem try unloading all the books from the reader and loading only a very few books
- If even that doesn't help try resetting the Reader through the reset hole on the back according to the user manual page 68 (see document
http://www.docs.sony.com/release/PRS505.pdf )
- then try restoring default settings according to the user manual page 76 (see document
http://www.docs.sony.com/release/PRS505.pdf )
- there is page describing "hard reset"
https://wiki.mobileread.com/wiki/Sony...ctory_settings but this is for PRS500. I do not know if it works for 505.
see our page
https://wiki.mobileread.com/wiki/PRS505 for further inspiration
- Let us know if it helped, so anybody who searches this forum for help with similar problems can read your solutiuon