Thanks, I'll take a closer look, though I doubt that's it since the problem migrated to the new airframe so all of that is brand new.

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I checked and that's not it, no actual damage visible to any of the mechanics.
A friend suggested maybe it's just the cold affecting my batteries. I'm flying in my garage, which tends to be around 0 C and sometimes am flying after the helo's been in my car trunk in sub-zero temperatures for an hour or two. THis is a tough one to make a call on, since my home's a bit too small to fly around in.
I've read a few threads elsewhere about NiMh batts performing sub-par in cold conditions, perhaps I should finally crack out the LiPo and give it a spin...