While playing X4, regardless of where or what I'm doing (read: not a map issue etc), my frames will go from 60 to 1fps. It will stay at 1fps for a few seconds (the game is frozen, as is the mouse, though I can alt tab out) before it picks up where it left off. This happens every minute or two in playing, but I feel like with the last few patches it got worse (as in, this is the worse it's been - before, I could play for half an hour without getting the same style of freeze). So it changed from an intermittent problem, to one that makes my save unplayable.
No mods, or scripts. Probably about 200 hours on this save game. I do have a mega station, though as far as I could tell my system could handle the performance hit and I didn't see any unreasonable FPS issues around it (ditto for map).
My save game is from around release, but my game is patched up to date. Changing video settings doesn't impact the issue occurring.
The last thing I was trying to do in my game was (I think) build a decorative spaceweed station with over 20 landing pads

I started a new game to test if it was the save, and the game runs fine without any stutter. I'm not sure what or how to post a log/error report - so I'll just post a screenshot of MSI Afterburner which tells the story on behalf of my GPU

https://i.postimg.cc/gc7MxgFz/Untitled2.jpg
While in-game my FPS will drop to 1FPS, in MSI Afterburner my GPU Usage is actully dropping to 0%. So it's not the game lagging my card, which is really curious! My card is kicking out for no reason, and it only occurs playing this game.
I'm having trouble wrapping my head around how to solve this problem, and if anyone could give me some insight i'd super appreciate it! With all the fluctuation happening on my GPU because of these problems I don't think it's wise to play the game until I figure out what's happening! Cheers folks, happy X4ing for the rest of you!
The second problem is for sure a super easy bug to figure out for anyone I think. I assigned a construction ship to build a station in Hewa's Twin IV The Cove, but due to some issue in the assignment what happens is the modules count down from 1:00 to -1:00 and back without ever completion. I was able to assign another faction's construction ship to the station though the problem persisted. If I change the arrangement of the modules, or try to remove any other very weird glitchy problems happen as well and I'm unable to use/complete that station.
EDIT: Here is the save file:
https://ufile.io/oaequ
i5-9600k @. 5.0Ghz
ASUS Prime Z390-A
EVGA Geforce GTX 1070Ti 8GB
Samsung 970 NVme M.2 as boot
16 GB G.Skill Ripjaw V