Environment: Multiplayer server with medium amount of players, multicrew with human WSO, single threaded DCS build.
Problem:
It seems like multiplayer lag spikes make the plane think that it pulled a lot of Gs, and break the INS system.
Had a cold start, took off (no issues or aggressive maneuvers, it was a very smooth takeoff), got a ~1-2s lag spike (likely unrelated to F4). After the lag spike, the G-force indicator suddenly showed that I pulled a max of 10G, and INS stopped functioning.
This happened multiple times throughout different game sessions, and has never been an issue with other planes. (Always with human WSO, haven't flown much with Jester, so not sure if that's relevant).