This happened to me a short time after NEXT came out. The crashes centered around a base with a very large footprint on a cold planet. I had a frostwort farm there, and the base was built with glass everywhere, including about 10 Bio-Domes. Incidentally, I also had about 8 landing pads and had intended to continue adding them until I reached 10.
Crashes became so bad that if I looked away from the base and back toward it, I would invariably crash.
I carefully and tediously dismantled 2/3 of the base during a series of quick trips, deletes, and saves, trying hard not to look at the entire base at once. I also moved my planted frostwort to the region that once contained my foundation. I now have two landing pads, no Bio-Domes, and a structure that is 1/3 the length of the original, but no crashes at all. I’ve attributed the crashes to problems rendering too much transparency, but that’s just a hypothesis. I had all walls, doors, and floors transparent in a building 4 floors high on a massive wood foundation. This may not help, but you might consider the transparency or restarting the base in a different environment. Do you crash when you are not around the base?
Incidentally, the name of my formerly unstable base is Frostwort Farm, but I considered renaming it Medusa, because every time I looked at it, the game turned to stone.