Right button moves character left

I have an OCTOPUS Game & Watch that works fine except that lately, if I press LEFT once during the game, LEFT stops working and if I press RIGHT the character moves left for about 5-10 seconds and after RIGHT moves the character right again, the problem repeats itself. I did try to do a light cleaning with rubbing alcohol and although the buttons are more responsive, the problem didn’t go away. Has anyone else experienced this or know how to fix it?