Out of Sync Captures

Hi All,

Apologies for the vagueness of this issue, but we've been seeing a few tapes here and there that after completing capture, don't specify any issues, but the captures are out of sync.

They begin with sync and slowly drift out of sync. This isn't widespread, but I would say out of every say, 100 - 200 tapes, we have 1 that becomes out of sync.

We've seen it happen more often with Digibeta tapes with 4 channels of audio, but today I had a VHS tape become out of sync, when the tape clearly is in sync.

Any thoughts on what we may be experiencing?

For further context, we are capturing over a gigabit network to a 12-bay Synology with a 20Gbe connection and set in RAID5 for reliability.

Thanks to anyone who might have experienced the same and is aware of a solution.