Recorded audio and video not in sync

[dougalco]

I have recorded a video through the zoom desktop client. Recorded it to the local disk, not uploaded to the cloud not down loaded from the clouds. The video is from a Canon Vixia, connected through a Can Link 4K. The audio is coming through a Roland Cakewalk UA 25 EX,  USB Audio Capture, vocals into that from an Audio Technics  microphone, guitar plugged straight in from the internal pickup. When I play it back on my own computer, that recorded it originally, the audio and video and out of sync, not hugely, but noticeably. Does anyone have any suggestions? I have not found this problem discussed anywhere. 

Thanks,
Dougal