Home Cybersecurity and Connectivity Fix

I need an expert to secure my home network and resolve multiple connectivity issues.

Key Issues:
- Devices (phones, iPads, cameras) show signs of unauthorized access.
- Interference sounds: talking from electronics, loud buzzing from cameras.
- Connectivity problems: dropped calls, slow internet, failed email logins.
- Irregular device behavior: powered-off devices appear online, altered settings.

Ideal Skills and Experience:
- Strong background in cybersecurity
- Experience with home network setup and troubleshooting
- Knowledge of audio/video interference issues
- Proficiency in securing IoT devices

Please provide a detailed plan to mitigate these issues.