Hacking Bottom screen problem

[Henrike]

I have a DSLite for almost two years and yesterday the problem started.
Some horizontal "scanlines" (like the ones from emulators) appeared in the bottom screen. They keep blinking, making the screen looks darker. I turned it off, and today everything was normal until now, when the scanlines reappeared. The touch feature is working just fine.
The strange thing is that it all started from nothing: no drops, no impacts, I was playing as always and then *bam* crazy scanlines in the bottom screen...
I couldn't get a good photo.

Thanks for the help