In my games, I tend to run into a problem at least once per session. My players just seem to follow the dice and make no effort to either engage with combat or chase adventure. They let the dice fall and decide what to do, but in a very OOC and tactical manner. The tension disappears, as does a lot of the roleplaying.
I really don't like it, but I haven't been able to stop it from happening. The players notice it too, but appear to think it's normal.
We play a homebrew sandbox campaign of AD&D 2nd ed. Normally the sessions are 3-4 hours long, with a few breaks for food.
Has anyone else had this problem, and if so, how did you fix it? (Note: I'd rather have answers that don't recommend other systems, unless you specifically state how the other system fixes the problem and how I can apply it to AD&D 2e.)
In general, how do you raise tension in your games (in the short-term, rather than long-term - less "Upon us rests the fate of the world, we must not fail" and more spur-of-the-moment)?
[I see the two questions as linked (raising tension is one possible answer to the other question). If I can increase tension, my players will probably be more focused. However, if consensus is that it is two different questions, I will edit the second one out and pose it separately]