Hey @Uveso . Hate me yet? lol
I don't know if this is under BlackOps or BlackOps ACU... But years ago there was a problem with Cybran ACU that the maser wouldn't function properly if the ACU got in a transport. That has since been fixed in Vanilla FAF (tested to make sure it wasn't reintroduced)
With BlackOps, that bug is still present. If the Cybran ACU teleports, it works fine. If they enter a transport, then when they land, it fires erratically, often not firing at all for long periods of time.
Let me know if I can provide a replay, but it's pretty easy to recreate also.
[edit] made a quick cheating replay with ping notations:
https://replay.faforever.com/19035328