Sounds like the plant just needed time to adjust, not a spot change.

The "training curve" part is what gets me, because I keep hearing it from guys who came up on copper and they all say fiber was easier to learn, not harder. My take is the old coax work had a thousand little feel things you had to pick up by touch, like getting a connector seated just right, and fiber just needs clean habits and decent eyes. Less art project, more following steps.

The hold thing usually isn't Interac at all, it's the sending bank flagging the first few instant transfers as unusual. I've seen it hit on Sundays because the fraud teams are running on weekend staff, so a $200 payout sits there and nobody clears it till Monday morning. Check if the holds line up with the first transfer from a new account rather than the weekend itself.