Final answer:
The three most common error types on the X1 platform are video playback errors, audio syncing issues, and login problems.
Step-by-step explanation:
The three most common error types a customer could encounter on the X1 platform are video playback errors, audio syncing issues, and login problems. Video playback errors can include issues such as buffering or interruptions during streaming. Audio syncing issues refer to the audio being out of sync with the video, which can greatly affect the viewing experience. Lastly, login problems involve difficulties in accessing the platform due to credential recognition errors or system outages that prevent user authentication.