Mobile Data Dropped From LTE to H+

Hey all, I’ve notice when i play game such as PUBGM or Mobile Legends, my connection will drop from LTE to H+. Specifically happens when i launched the app, I can see that the phone is somewhat restricting my mobile network to H+ when I’m playing games. But to other games like Clash Royale or Dota Underlords, connection is perfectly fine. Let me know if any of you have the same problem or a solution. Cheers