my RCI amber face 2970 jumps around on frequency. i can have the radio on listing to it then all of a sudden it will act as if some one is truning the clarifier knob back and forth. also some times intermentently it will be as much as 10kc off when i turn it on but not always. i may turn it on it's perfectly on frequency then after a while it may just drop the RX and when it comes back it will be off freq 10kc. the radio is hooked str-8 to the battery. it maybe co-incidental but i notice this problem seems to have started after the face was removed and bulbs changed out.