I'm with Issac.
If it's an 8-slot cRIO, then I'd clean it out first.
There's a very real possibility that metal dust & debris has worked it's way inside the cRIO and is causing intermittent shorts. You fix that by carefully opening and
following directions to clean out the cRIO case. They are pretty tough birds and usually don't suffer lasting damage from that.
If that doesn't help then it might still be under warranty (I think three years from being shipped from NI). In any case NI support is only a toll-free call away.
(866) 275-6964 from 8 a.m. to 6 p.m. Central Time, Monday-Friday