@Kevin_Z 

Here i have collected some Data...i have run ping in my 2.4g wifi and the started playing games...i have noticed when the router ping goes high at that moment game ping also get much higher...i have included all the documents i have gathered here.

Here is the Data when the ping spikes happened 

here is the in game screenshot but i couldn't able to screenshot while the ping is higher that 500ms but able take screen this

  @Kevin_Z 

i have done all the troubleshooting. the ping spikes happen only when i play with 2.4g wifi connection rather than that everything is fine...this problem was worse before the firmware upgrade to the latest but still causing  problem of ping spikes...i have asked archer c20 users they have also said about this problem

  @Kevin_Z 

i am sure that this is a firmware problem ...tp link should solve this issue as soon as possible

  @Kevin_Z 

Previoulsy i use to play online games with TL-WR720N 2.4g Router. i used that almost 5 years and then i bought this Archer C20 Router And Faced this issue but this ping spikes problem was terrible before this firmware upgrade

this upgrade solve the problem partially but still after some time 3/5 min suddenly ping spikes happens and because of this in-Game ping also get higher 

as you can see in this screenshot.

As i dont have my old Router i cant able to show you the ping of the router i used to get... i want to mention you that i am in the same environment i used to before and in my old router channel was in auto mode...

if you say that this is because of heavy congestion then why this problem occurs in every Archer C20 Router User They are in the Differernt Environment. i have asked many users They have also said about this issue ..

i have  tested Router ping with my Laptop Dell-inspiron 14 3476 and its wireless driver is up to date..