[pitza]

Hello.
With the premise I've been looking around the site for the past 45 minutes, I need some help with my Kindle Paperwhite.
As soon as I bought it, I could put any number of books in it at the same time, and it would show them all perfectly. It only happened once that a book didn't agree with it, so I had to delete that particular book, and everything started working again.
Since a few months back, I could only put in five books at a time, or it wouldn't read any of them; then four books, then three.
Today, I wanted to put five books in it. I put in the first two, and it didn't show them. Deleted them, put in the other three, didn't show them either. I put in all the books, one by one, and it still wouldn't show them.
I've read somewhere on here that I should try reconverting the books to mobi, and I did that, tried putting them in again, and still nothing.
Sometimes it does do this, but I can still find the books by searching them by name or author; but this time it's not reading them at all. I've rebooted it five times already, and nothing changed.
Any suggestions?
Thanks in advance!

PS:
On top of it, I just checked and there should be 243 books in the Kindle, but it actually shows 253, for some reason...