Crop up
Definition 1 of 1
Pro Tip 1/3Unexpected Events
Used when something happens without warning, often causing a change in plans or requiring immediate attention. 
A new competitor cropped up, disrupting our market strategy.
Pro Tip 2/3Neutral Term
Expresses neither a positive nor negative attitude towards the event, but implies it was unplanned. 
Technical glitches cropped up during the live stream of the event.
Pro Tip 3/3Common Contexts
Often used in everyday contexts, for minor problems or unexpected tasks that need to be dealt with. 
I'll be late; some last-minute tasks cropped up at home.