I'm getting some serious jitter of all the servos. I used to experience this when the Rx battery got low on charge and it would disappear when I swapped out the battery. Now I'm getting it even with a freshly charged battery in both the Tx and Rx and it's pretty much constant. Even worse, the Rx doesn't seem to recognize the Tx when it's even a short ways away (more than about 2 feets). From a (very) short distance I still have control but even then there are jitters.

What's going on here?

The model was recently involved in a crash but I don't want to just to conclusions that THAT is the cause of the radio problems. Still I didn't make any changes to the radio set up during the repair.