I think that the problem is finaly solved. The last 7-8 days i have removed my bartop cabinet and put it away from my wifi router and laptop. I don t know yet which of those two caused the hole problem. Anyway everything it s OK now. Thank you very much for your help and support. Thank youuuuuu!!!

@dragu i had the problem even with the jack unpluged. I put the cabinet to another place away from the internet router and laptop to see if this is the problem.

I have changed everything. Pi, micro sd, encoder, joysticks, all the cables including the power supply of the pi. All except buttons and screen. Generally i made the two cabinets with exactly the same way and i have the problem only in mine. Substring what does "generic ground problem" means? And what is the conclusion of the evtest i attached?

Here is photos of my setup. I have built two identical bartop cabinets https://postimg.cc/gallery/20r8hezj0/026a7816/ with different screens one for me and one for my brother. Only mine has the problem. I replaced everything from my cabinet. Now the second player is unplugged. https://postimg.cc/gallery/10wc7yuzg/eff0777a/
I have followed directions from here
https://www.google.gr/amp/www.instructables.com/id/2-Player-Bartop-Arcade-Machine-Powered-by-Pi/%3Famp_page=true and here
http://youtu.be/hpLp929pM4c

Ps. I have my cabinet over my laptop and near my router. Is it a problem?

@substring here is the evtes during the problem https://postimg.cc/gallery/2t129wh3w/b01e24f1/
And still is writing and writing and writing

@substring i realy don t know. But i have the same problem even without connection at all

@substring so i guess this is not the broblem?

@substring i tried yesterday to run evtest when the problem began again but i noticed that the pie was out of internret connection. Then i tried to connect to my wifi and i saw instead of my wifi key this https://postimg.cc/image/ilx9c1jkn/343a9b6e/.
I didn t touch anything. I think that if i manage to put my wifi key and connect to my wifi i will solve the problem. But temporarily. Can you think what is going on now?

@substring when the problem began i had those inputs even with the xin mo unplugged. Now i haven t try it again. I have already replaced the whole xin mo set exept the buttons, the raspberry pi , the sd card and all the cables. The only thing i haven t replaced yet is the screen because i haven t a second one. But i still have the problem. And it begins after 2 or three hours or more after switching on the console and not from the beginning. I made a second bartop cabinet with the same setup for my brother with no problem at all. Mine bartop has the problem. I am so desperate!

@substring here it is.
https://postimg.cc/image/rzwpj3q3b/b80aabbe/

Now the player 2 buttons are unplugged. I try to isolate the problem but u fortunately i can t