iPhone 12 causing ping problems on modem.

When my iPhone 12 is charging it affects the ping I get from my modem. I noticed this while playing league of legends. I had around 160 ping on my pc that is connected to my modem. I took my phone off of the charger and after 2 minutes it went down to it's normal 55 ping. I then put the phone back on the charger and 2 minutes later back up to 160. I did this 4 more times to be sure and it went up every time I had my phone on the charger. I then swapped the charger (original one was a qi charger) for a standard apple charger and plugged it into a different outlet in my room. Same thing happened, 160 ping 2 minutes after plugging it in and 2 minutes after unplugging it back down to 55. I have recreated this countless times so I am sure it is nothing else interfering with it.