Audio questions freeze my browser

[Anoplophora]

A friend recommended Duolingo to me, and I just started learning German. But suddenly whenever an audio question pops up my browser freezes. Both Firefox and Opera freeze, and it was working fine for over an hour before. Does anyone have any tips on how to get around this besides culling audio questions altogether? Thank you very much.

Edit- Someone in another thread from 2 months ago said updating Java fixed this, but I did that and it did not help. My browser does not recover and I have to force quit it.

[Anoplophora]

I restarted my computer and it suddenly worked fine. If anyone else has this problem I recommend trying that.