Issues starts after upgrading the firmware.
I bought this TP Link C64 router last february 2024 and used this router without upgreding for a while. It was really good all-rounder router as I was getting top notch performance from it. After few days I saw an firmware update comes and I searched about the new version and amazed to know about some new features introduced in newer version. And I upgrade it. After upgrade I faces significantly WiFi range drop compare to previous version. And still today I am looking for the soution for this. I know wifi range depends on router position and environment. And my router remain at same position and place as it were before update.