I had a couple of CTD's during one patrol in the Sargo class boat in late 1943. After the third reload of a Save file i was able to make it back to port. The CTD's occurred when I was within 25Nm NW of Rabaul, in the Bismark Sea. After racking up several merchies, I encountered an IJN TF and got lucky, sinking a light or escort carrier and a Takao CA. While making my escape from the pursuing DD's I upped the TC to help kill the suspense.
As soon as it got to 512x it crashed. Both times. On the third load of the same save game, I let it run at 32x until I was well clear of Rabaul. As a test, I then ran at 4096x TC all the way back to Brisbane with no problem.
There were constant air raids over Rabaul, numerous air patrols, and a fairly large save file because of my mission successes. I've learned to never use excessive TC when within 25 Nm of ANY port, especially if there is air activity or a large number of ships in the port.
Propbeanie spoke to this a long time ago, something about multiple spawns, lots of planes, etc. The problem at that time was excessive stuttering at any TC above 256x-512x or so, not so much CTD's. I had forgotten. From now on I will draw a 25Nm diameter circle around any enemy port and avoid using TC when within that circle.
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