It happens to me when I feel tired and I just stop playing... Then listen to music to relax
Losing streak

keep playing until you beat someone who doesn't want a rematch and then quit and go study an opening you like to play and do 10~20 mate/tactics puzzles before playing again.

I keep playing until a manage a win,then i stop and enjoy the moment before getting my ass kicked again.......
Do you ever just get into a losing streak where it seems like you just can't "get in the groove"? How do you get yourself out of it?