Clear app cache (Settings > Apps > KingRoot > Clear Cache). Reinstall if needed. Also, disable any overlay apps (e.g., Facebook Messenger chat heads).
However, for newer devices or users concerned about banking apps and security, consider Magisk instead. KingRoot, while powerful, has not kept pace with modern Android security models. kingroot apk version 8.1.0 download
Yes, if downloaded from a trusted source. However, because it uses exploits to gain root, antivirus software may flag it as a “risk tool.” That does not mean it is malware. Still, avoid modified “Pro” versions from unknown forums. Clear app cache (Settings > Apps > KingRoot