RDP session, typing wrong letters

Hello, i am trying to figure out why sometimes i cannot type the letter L when connected trough RDP to my terminal server. In session opening a note and typing the alphabet, i seem to be missing lots of characters. This is not on my own PC but only in RDP connection. When loggin out and in the RDP session its not resolving it. The only way to resolve it for that time is to reboot the pc