Nobody knows. At this point you have 2 options though.
A) Stay offline and grab all weapons but stay away from multiplayer until patched
B) Play multiplayer and don't worry about the weapons until patch comes out
I already lost several weapons, and it only took about 2 days to recover every weapon, so it's really up to you. But for those of you who have every weapon like I do, you'd do well to stay offline for the moment
Missing items = save data corrupted.. This will usually happen if you're saving and then shut down your console, or I've heard people have a problem when it's saving online and they get disconnected. Basically it kicks you out to the menu before finishing the save and so your data gets corrupted. Best just to avoid online play altogether for now..
Gamespot gave Big Rigs: Over the road racing a "1". Not only does it deserve a 10/10 but they riddled the review with lies as well. - Bonboonman
what happens is that you get disconnected during the course of the game; it does not matter if you have been to the map. The game will not recognize your save and delete it. I have lost my stuff more than once but I still play online.
best south park character ever: a taco that craps out ice cream