Scylla Costa wrote BioWare is aware of the cheating that is occurring in multiplayer. We believe our multiplayer mode is a valuable addition for our fans, and we hope you are having just as much fun as we are while playing co-op with
your friends.

For our fans, we acknowledge that some people are cheating. We are actively monitoring server logs since the Demo of Mass Effect 3 and when we find obvious signs of cheating, we are acting against those individuals. Our focus is to remove the type of cheating that is detrimental to the honest fans.

To some of you, it may appear that we are not doing anything against the cheaters. This is not true. However, we are being careful to ensure that the individuals flagged as cheaters are clearly and repeatedly cheating. We do not want to act against honest people.

If you feel your experience has been affected by playing with a cheater, please send us a message at me3mpcheaters @ bioware.com. Please also add the Origin ID/Gamertag/PSN ID of the supposed cheater
along with the time of your match(es) with him and why you think this user has been cheating.

We appreciate you help and patience with this matter.

PLEASE NOTE: Before doing this glitch you will have to turn off the setting which sends your Game Statistics to EA. This will help you avoid being caught and banned or reset (it is unclear how Bioware/EA will respond). You can turn off the Automatic Reporting of Game Statistics to EA by going to the Main Menu. From the main menu, navigate to the "Extras" menu, once there go into the menu entitled "Options." Once in options scroll down to "Online" and switch the toggle for "Upload Gameplay Feedback" from [On] to [Off].

In order to do this glitch, you will have to get to Wave 10 on any map with any difficult/enemy.
The way the game is structured, Wave 10 will ALWAYS be an objective. Once you have gotten to Wave 10, you will have to finish the objective and then have your whole team die before killing the remaining enemies.
For getting this far, your whole team will get the normal rewards based on the location and difficulty. Once the game has ended, and you are back at the lobby, the host will need to change the game difficulty to Gold and also change the enemies whichever group you want to fight. Personally, I prefer the Geth seeing as they are the easiest to kill.
Once you have changed the game settings, start the game; before starting the game make sure that you know who the host is. At the start of the game, have the host quit immediatly (if you are a bit slow, the glitch works until "Wave 1" pops up on the screen).
The game will then migrate hosts to someone else on the team with the next-best connection. This will cause the "round to restart" and the game will now go back to Wave 10.
Begin working on completing the objective, but do not complete the objective until the host has successfully joined back. Once the host joins back, you can finish the objective and get your credits. Once you have completed the objective have your whole team die (just like how you all died at the begining). Generally you will receive anywhere from 38-45 (thousand) credits per round depending on how long it took for you to finish the objective.
The game will end, and you will all be sent back to the lobby, and someone else will be host. From here, ready up again and repeat the process. (Start game, host quits, complete objective, die, go to game lobby, and repeat)
The only catch to this process is that the objective you get the first time will repeat itself over and over. So, if you get the hacking objective when playing through the first time (generally on Bronze), I would recommend ending the game and re-trying because it will take you ~Three minutes to hack the objective each time. The other objectives are much simpler, and have little-to-no catches.

It might seem a little complicated at first, but once you've got the hang of the glitch, you can get about 45000 credits every 3-5 minutes.