Nikola

I have a problem with my Makita Power Hammer Drill. The problem is when i use the drill feature on it and try to drill through a harder surface usually didn't have a problem but now the safety feature that stops it from jamming and hurting you turns on really fast and it doesn't drill. So my question is how can i fix it, or maybe i should replace the part all together? I need help fast, I need the drill.