@Kevin_Z Thank you so much. My problem is solved after updating the firmware you provided.

@Kevin_Z the version given in your link is the latest version which is giving problem in my router. I wanted 2020 firmware version of archer c6 v3.2(us).i cant remember factory firmware version...

After updating my archer c6 3.2 (US) firmware to 1.0.10 Build 20210513 rel.63256. My all wireless devices having high ping but wired connection is ok. Tried factory reset multiple times. I want to...