Roaming aggressiveness is too high, or the adapter is overheating (typical for nano-dongles). Fix:
A: Possibly, but not always. Generic Chinese drivers are often flagged as "PUA:Win32/DriverPack" because they bundle adware. Only download from official Realtek or trusted GitHub mirrors. If Defender blocks it, scan the file with VirusTotal before proceeding. k4203 drivers windows 10