When you say they are beginning to fail what do you mean? I ran into some issues with mine this weekend that has me stumped. First off the BEC was going bad. Determined this by using a nitro receiver pack in the 3rd channel on the receiver to eliminate it cutting out for a few seconds when it was under load. Ran great for about 3 packs (45 minutes) then it started just loosing power bad. Now the ESC has no power from the Lipos...it was just getting juice from the receiver pack. I could plug in the receiver pack and it would power up but when I removed that and plugged in the Lipo nothing happened. I know it didn't overheat and I know the switch is good because it would power up with the receiver batt plugged in. Im going to re-solder my connections just to be sure but the plugs look solid and I know the batts were good because they would run in other vehicles. Im at a loss at this point and hope I don't have to try and send this back to Hong Kong.