You are a system administrator for a financial institution. Most of your employees work at home and have various work environments.

One of your account managers is complaining that customer data is disappearing from her account management application. She insists that she saves data regularly and has not had a problem until recently. Her workstation has both a solid$-$state drive $($SSD$)$ and a traditional hard drive. She runs the application from the SSD drive, but stores the customer data on the hard drive.

She has recently moved her desk to a room in her house that is used for entertainment. The room has a sound system with several installed speakers for surround sound.

Which of the following types of interference might be causing the issue with disappearing customer data?