mikey, since you used diff pres and it was present in both, it has to be either
1. 722
2. mics(are your screws on the 460 bodies tight enough? i had weird problems with mine in 2000 and all i had to do was tighten the body screw a bit
3. cables?
4. battery cables?
1 - this is my primary suspect now
2- i will check the screws but i would think if that was the case the problem would occur more frequently or at least wouldn't all of a sudden stop. there is a possibility that it is one of the bodies, but it would be a coincidence that the same body was used for the right channel both times the issue occured. i wish i had a pre with meters on it so i could have seen if the signal was droppped before or after it reached the preamp
3 - i was using different cables from mic > pre and different interconnect for the right channel for pre > 722 so I have eliminated that possibility
4 - the only power cables involved were those powering the preamps - while possible, i eliminated that as well when I eliminated the chance it was a preamp