The German giants are currently nine points clear at the top of the Bundesliga table and are also in the running for the Champions League and the DFB-Pokal.
"The problem is we are only halfway through the season," he told Bayern's official website.
"It means we have to stay very, very calm and always remember we still have a long way to go yet.
"It can all change very quickly: you sometimes lose a match unluckily due to silly goals, like the home meeting with [Bayer] Leverkusen in the autumn, for example."
Bayern will take on Stuttgart away from home in the Bundesliga on Sunday.