The Master Everdrive starts to do strange things

I play with my Master Everdrive in my Master System 2 pal version every day and I observed that the everdrive can´t load games that works perfectly 1 month ago.
The screen black is what I see, and the list of playable games is decreasing highly.
Anybody with the same problem?

 

try to reformat sd card and reload your romset

 

I did it yet. I tried with different SD cards, with different roms with differents OS versions, of course before post.
I don´t have any idea of the problem. My everdrive is 8 months old, this happens withs games aleatory.

 

i can replace your pcb, if problem in cart

 

I´m speaking with Emere, who sold me the Master Everdrive, to check it.

 

you may send cart directly to me, if you would like

 

Emere give me a new Everdrive, this people always give me a perfect attention.
Now the new Master Everdrive works with 99% of the roms. I redownload a few damaged roms and works. I´m trying to download a few roms that dón´t work for a perfect compatibility with all pal games.
Thanks you krikzz too for your answers, a perfect support and your work upgrading the software, hardware and operating system of the Master Everdrive.