I have packet loss, my bullets do not go in online games, sometimes I play well in the game, sometimes I play badly, what is the reason for this?

I think I have a PCK problem on the devices on the network side. I AM EXPERIENCED PCK PROBLEM WITH MY ISP Core Router, ISP Router, SSG, BNG, OLT, SPLITTER ONT DEVICES. PACKET LOSS SHOWS IN MY PINGPLOTTER TESTS. HOW CAN I SOLVE PACKET LOSS PROBLEMS IN MY DEVICES IN THESE NETWORK LAYERS?

ACTUALLY, I AM LOOKING FOR AN ANSWER TO HOW WE CAN SOLVE THE PROBLEM. I PLAN TO SOLVE THIS PROBLEM BY CONSULTING WITH MY GOVERNMENT EDITORS AND HAD MY INTERNET SERVICE PROVIDER INSPECTED. ISP KEEP SAYING THAT IT'S NO PROBLEM. HOW CAN I PROVE THAT I HAVE A PROBLEM AND WHAT EXACTLY IS THE SOLUTION TO THE PROBLEM? FOR EXAMPLE, IF I EXPERIENCE A PROBLEM CAUSED BY DEVICES ON THE NETWORK, WHAT ACTION SHOULD BE TAKEN TO SOLVE IT?

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