Motor Loses Power

[bobby2400]

I have a 112 Johnson Special on my 76 V and the last couple of times out after runnig for around 15 minutes at higher RPM's all of a sudden it will just lose power sometimes for just a split second and sometimes for a few seconds. Once I slow it down it seems to idle just fine. A couple of times on the way in from Striper fishing I thought it was going to die. Any Ideas? ??? ???