My 2013 CBR600rr starts to bog after a hour of riding. With the throttle applied for normal 55 mph cruise and isn't moved at all, the bike will bog down, drop rpms for approximately 2 seconds, then return to normal for 10 to 15 seconds, then bog down again for 2 seconds and so on and so on. This will continue until I park the bike for 20 mins or so and it is back to normal for another hour, then it starts again. The temperature never gets above 175. I have changed plugs, cleaned air filter and performed normal maintenance (oil, oil filter, etc.). I cant figure it out. The bike runs great and is strong, but starts this crap after a hour or so. PLEASE HELP. Thanks in advance.