This is pure speculation but a couple ideas (the 1st one is a bit more rooted in educated knowledge):
1- If the ride was running 2 trains, something may have delayed the train on the brake run being brought into the station. This would cause the lift hill to time out and stop.
I'm not sure what SWs Ops procedures are but if they aren't allowed to re-start the lift (its not standard ops mode) with people on that would be an evac.
Alternate possibility is something in the station faulted causing the ride to require maintenance mode to reset it. They can't do that with guests on so this would also require en evac.
I guess what I'm saying is that it's possible to have an evac on the lift when nothing is actually wrong with the lift at all.
2-A wooden coaster, the maintenance and checks of, and all that's related is totally new to the park. The late openings are more than likely due to a late handover from maintenance to ops. I think we'll find as the brand new to this maintenance team finds their groove with the ride the late openings will be less and less frequent.
Thats just my 2 cents on those two matters. I have nothing to add about why it may be stopping during the day, but could be part of the above.
Our rules here are pretty strict, something as trivial as a fault reset in other parts of the world, requires an evac of guests here and entire restart of daily opening checks.
Where as Disney will pump trains on and off a ride at will by the operators, in Australia this requires the maintenance team and a ride shutdown.
There are pros and cons to both, it may seem like over the top and a capacity killer, but also it means you don't have an incident like on the Smiller at Alton Towers happening.