When I fast Travel to The Slog I can hear gunfire in the far distance (not sure where exactly or what exactly it is) and then it says "The slog is no longer allied to you". I have in no way done anything to harm my standing with this (or any other settlement for that matter) because this is one of my favorite and most developed settlements. I also have purposefully not gone as far into the main story line so that my standing with any faction would be negative or hostile. Tried reloading and fast traveling and also tried fast traveling somewhere near by and walking there to see if I could find the problem before it started.