Sim3 Crash from time to time, With no error Message on Screen

@LeoSalinas73  That memory usage limit setting won't have any effect.  Sims 3 is a 32-bit app, so it can only ever use 4 GB RAM before it crashes.  The real limit is more like 3.7 GB, and if it hits that for even a second, it will crash or throw an error.  Saving takes more memory than regular gameplay, so your attempt to save can fail if you're anywhere near the RAM limit.  An Error 12 means the game is out of resources, usually memory but sometimes VRAM.

The only solution is to try to keep Sims 3's memory use as low as possible.  There are ways to manage RAM use, but if you see it approaching 3.5 GB, all you can do is save, quit (without saving, as a separate step), and reload.  Other things that will help:

• Turn off memories in game options—they're a huge resource hog.
• Disable the hidden object interactive loading screens and the in-game shopping experience.
• Play offline, as in, turn off wifi and/or disconnect the ethernet cable.  You can sign into Origin first and put it in offline mode.
• If you want to build or use Create a Sim, do it at the beginning of a play session, save your progress, then quit and restart.  Both CAS and Build/Buy use more resources than live play.
• Even better, you can build or play with CAS in a new save, and then save your work to the in-game bin.  Then you can quit to desktop, relaunch, and place the sims or lots in your existing game.
• Don't place too many objects on your sims' home lot.  If the house takes too many resources to render, you'll have less RAM left over.
• Keep your sims' inventories relatively empty as well.  Having a few objects is fine, but hundreds can drive up memory use too.
• Some player-made worlds use too much memory right at the beginning, and it's impossible to play them for very long before you run out of RAM.  When you start a new save, it shouldn't use much more than 2 GB RAM, even if you have all packs installed.  If it does, then that world is probably too large or too detailed to play properly.

You don't need to do all of this; just pick the options that you can live with and see how it goes.  Managing RAM use can be annoying, but once you get used to it, it's not too difficult.

Other than the suggestions above, certain NRaas mods can help.  ErrorTrap and Overwatch are great, but since you have all packs, you may want to add Traffic, which limits the spawning of vehicles in real time (Overwatch just cleans them up every night).  Register also helps with managing role sims.  And if your sims travel, it's a good idea to add Traveler as well; it makes the travel transition much more reliable, and it cleans up other vacation-related errors as well.