Hello. The same thing we have seen with arma3server.exe, from 45-50 FPS drop to 4-7 FPS. RAM occupied more then 3 GB by this process, but NO CRASH! (No video acceleration used on server with dedicated mode?).
So, I have noticed, that our players with 4 GB of RAM NEVER felt this error.
Players with 4+ GB RAM, but with old CPUs Intel like Quad Core or iCore 1st GEN felt this drop rarely.
The most affected are CPUs from 4th and next generations of iCore. If 2nd Gen. working like 3-4 hours without drops, 5-6t start to drop about 1.5-2 hours ingame time.
So, I think the problem is on the memory and velocity of RAM bus. Possibly, PAE does not supports by Arma3 and then it eats more than 3 Gbs of RAM its starting to violate 3.5-4.0 GBs sector of RAM with device interruptions? https://en.wikipedia.org/wiki/Physical_Address_Extension