SH4 + Trigger Maru OH

I had not played SH4 since I got my new PC many months ago. So I installed it, and, for the first time, one of the major mods - the latest version of Trigger Maru Overhauled (started off with the easier AI option installed also).

In my very first campaign the first thing I ran into was a destroyer. I was underwater, far away and running slow. He picked me up somehow?? (a psychic on board I figure) but that doesn't bother me. However for the next 25 hours (and longer if I had not quit the game) he circled me in the exact same pattern over and over no matter how deep I went, what speed I was traveling at (I stopped for hours), which direction I went etc. After years and years of playing Silent Hunter I have some idea as to how to evade but tried every trick. Nothing. He only attacked once at the beginning of the 25 hour session and never again. But it was his doing the same pattern for all this time (exact same circle without attacking) now matter where I went that did not make sense. Anyway I got so absolutely bored that I finally just quit the game. I am not complaining as I am sure there are many fine things about this mod - but boy that was strange and so very dull.