My 2013 Kia optima hybrid randomly loses acceleration and I have to pull over. All I have to do it turn it off then on and it works fine again. On...

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Symptoms of the "Check Hybrid System" alert include:

• Reduced speed and acceleration.
• The hybrid technology is not working, and your vehicle operates purely on gasoline.
• Fuel efficiency is reduced.
• The vehicle enters limp mode.

First thing to check is the Hybrid fuse that is connected to the batteries. Replace the fuse if necessary. If the light still goes on or comes on again in the near time, i suggest that you take the car to an autoshop and have the vehicle scanned using a scan tool. This will point the main issue of the vehicle. 

In my personal experience, once the hybrid light turns on, the most common issue would be the hybrid fuse, battery (one of the modules in the battery pack has a defective cell), worst is the electric motor or transmission. 

Let me know if you have further questions. 

Fuse normally gone bad due to wear and tear overtime. I suggest that you replaced it first because that is the most common issue for Kia and hyundai. 

Leaking coolant has nothing to do with loosing acceleration. But you might need to have it checked as well because that might cause the vehicle to overheat in the long run.

Let me know if you have further questions.