Game version: 0.95.178

I had to load an old savegame because of a never-ending spacewar. I attacked a 
planet, fired some rockets at the enemy fighters and retreated. However the 
fighters advanced and two rockets couldn't hit them, they just circled around 
those fighters endlessly. The fighters tried to shoot them but where too slow, 
thus turning around and around endlessly, never hitting the rockets.
Since I had no ships left on the screen, I couldn't attack the fighters either, 
the rockets never found a path to hit the fighters....

It's hard to reproduce this exact situation, but I hope you can imagine the 
problem. A possible solution to this would be, that rockets have a 
self-destruct after... I don't know... 30 ... 60 seconds?