Anyone else experiencing the problem with modules and weapons "resetting"?

You purchase a mod or wep, and after a round or two it is no longer purchased and you have to buy them again.

Also all your possible kills that you made with these mods/weps are reset to 0 since you "haven't bought it", so you are unable to progress towards new unlocks.

But you can however use it in the game as if you did buy it, but you don't achieve anything with it... hence no kills registered.

...?

I too have a problem with resetting the improvements, modules, etc. Maybe someone from Crytek denounces here

Its because the game only saves your multiplayer progress when you manually leave a server/match. If you play 5 games in a server and then get disconnect at the last one you will lose the progress for ALL of those games. Same goes for unlocks and anything else to do with your multiplayer profile.

I would suggest manually leaving pre-game lobbies every 2 or 3 games and then re-searching for your desired gametype until Crytek grows a brain and makes the game save progress after each match.