Welcome to TPG Community!
We have located the account using your community details and we were able to check the status of your connection.
We are not detecting any fault on the line or network at the moment, but we'd like to investigate further to identify what is causing the issue.
Please run a Ping and Traceroute test at the time you experience the issue. Please send us the screenshots so we can review it.
We'll wait for your response. Thank you.
You may wanna try to check this link https://kb.netgear.com/19863/Ping-Test-to-determine-Optimal-MTU-Size-on-Router, I'd tried it my self and got a better ping on League of Legends.
Please proceed with caution as you may need to get in to your modem/router setting to do some tweaking specific to MTU or anything synonimous to it, see the screenshot of my Ciscon Modem where I saw an option similar to MTU.
Note: Proceed at your own Risk.