Thanks for your reply, I'll check the support ticket asap and do what you suggest!
As I already mentioned in the first post, I don't own the Jupiter-8 VST nor the V-collection.
I just decided to post this here, although it seems to be a bug within the Analog Lab software, because to me it seemed like the only synth affected by this bug is the Jupiter-8.
Now what I DO own is the "Analog Lab" software that came with the Keylab 25 (I assume it's part of every MiniLab/Keylab package).
However, I've never installed any of the demo versions. Not the Analog Lab demo nor any other demo of one of the synths out of the V-collection.
The fact that the sound drops out after approx. 20 minutes seemed to me like a bug "inside" the Jupiter-8 plug-in or inside the Analog Lab software, like Analog Lab treats the Jupiter-8 plug-in as if it were the demo version.
As I've already said, I NEVER have nor had installed ANY demo OR software from Arturia, other than Arturia Software Center, Analog Lab and MIDI Control Center and all of these are up to date.
Please check out my other thread (http://forum.arturia.com/index.php?topic=84835.0
) for more details.
Edit: Thread can be closed, updating Analog Lab to 22.214.171.1242 and/or renaming my computer to how it was named before I reinstalled Windows fixed the issue!