I also have this same problem after the first 2.5.6 update. Happens only with hornet and only thing whats helping after the stutter starts is to restart DCS. Problem doesn't exist at carrier.
What have i done:
-Updated windows
-Updated nvidia drivers
-Deleted metashaders and fxo
-Used "repair" function of the dcs_updater
system specs: i5 9600k@5ghz, asus 2080super oc, 32gb ddr4, 1tb ssd, hp reverb glasses landing_stutter.trk landing_stutter_readyontheramp.trk DxDiag.txt