In my experience, NedMalloc_bi Malloc seems to be the most stable, especially when eliminating the page file on a SSD.

For whatever reason, I'm not able to reproduce this issue. The only change that I have made recently was to add a Logitch G13 to my lineup (TM Hotas X, Track IR, G13). I will try and confirm later.

Not sure if it is relevant, but my TrackIR 5 never disappears. Only my TM Hotas X.

Same issue on Altis wasteland using Thrustmaster T-Flight HOTAS X. Similar workflow as others if not exactly the same flying a heli. Open and modify config and save. Controller no longer recognized in game.

Fresh install Win 8.1. Forgot to set up any configs prior to joining a multi-player game. Once in the game, the TM Hotax X was not listed. Back out, restart Arma 3, set some basic configs, then join MP game. Hotax X is now listed. Still can't change anything while in MP game or controller disappears, but I thought it was strange that it didn't show up at all if there were no configs assigned to it.