For me 4th was boring and even more disappointing considering that, after all they suffered to open the portal, all that they found was a ruined, minefield piece of shit planet.
Fith is being a little more entertaining but also turning the back to the portal.
Edit: also there's sound in space. IIRC that wasn't the case in the first seasons.
Nah, it's systemic. At some moment there were some missiles. There's no way to explain that, unless you believe the missiles make a transmition to the ship that launched them, to say in their noisy missile language that they're pursuing the target :)