思いがけない問題にぶつかるを英語でなんと言うか？

run into a snag という言い方があります。6:57 if you work at a compound full of nightmare creatures, serial killers and horrifying beasts, you're going to run into a snag every now and then.


Another Top 10 Over the Top Villain Deaths
https://www.youtube.com/watch?v=VAsnMDKqe-o  1:17 so we've run into a bit of a snag during the snow-plough thing. アストンでの雪かきはちょっとした問題にぶち当たってしまった。
Driving an Aston Martin in the Snow

参考リンク
http://bridge-english.blogspot.jp/2014/03/blog-post_4983.html  問題にぶつかるを英語でなんと言うか？
https://www.youtube.com/watch?v=INfUD6ON3gw  24:54 fixing snags before they become major issues.
The Worlds Biggest/Super Planes: Airbus A380 - Documentary