Frames per second are slowing down... Repair?

I have a Canon 7D that I use primarily for sports photography, so the multiple frames per second feature has been used a LOT. I have noticed that it is skipping or slowing down. Where one press of the shutter used to result in 7 shots in a row, now there is a break and they are spaced differently. I don't think I have changed an internal setting to get this result (although I will check).

Is there a way to repair that particular feature with good result? I photograph horses, dogs, humans in sport, so often track and take multiple images.

MFA