Several crashes to desktop

In administrator mode, for a TJCP-TNCM flight, 1:30 hours, no in-flight crash but a drop in FPS 3, i.e. an average of 19 FPS, 2 times the FPS dropped to 8 and I don’t know any the reasons, and at the end of the flight to return to the general menu, another crash and direct return to the office. It’s very annoying