Ryzen 5 2400g shuttering and laggging while gaming

Oct 12, 2018
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i got RYZEN 5 2400 G AND PAIR WITH A320 CHIPSET AND 3000MHZ RAM .... WHENEVER I PLAY PUBG IT GIVE ME 50 FPS BUT EVERY 10 SECOND IT GOES DOWN SUDDENLY LIKE 10 FPS its not just this in every game fos suddenly goes down .. PLZ ANYONE CAN HELP...i think its the frequency dropping issue of ryzen 5 ... how to make it stable for gaming.. plz help