The title says it , but i will describe the problem.I can not hold keys when i am in games.I did a test on this website: http://en.key-test.ru/ , and when i hold a key it flashes like i press it multiple times.If i hold CTRL , ALT or SHIFT , they don't flash.I have to say that every option from ease of acces - keyboard is disabled.The keyboard is a MARVO KG748. It has a Fn key and 5 customizable keys.The keyboard works fine , but when i am gaming , it destroys anything.I tried resolve this problem for a long time , and i came here , hoping for the best answers. Any opinion and answer is welcome , have a great day.