jbuhajla just and FYI from Tech Support...
Hi, I'm sorry about the trouble with your gear. If you're using 2 G10 systems on stage at the same time you need to sync them separately. Power up the first receiver, then plug in the transmitter and sync it. Then take it out and plug it into your guitar. Then power up the 2nd unit and repeat those steps. Don't try to sync one unit while the other is powered on, they will get on each other's channels. Let me know if you have any more questions. Thanks, Will - Line 6 Support