Hi Bill
REGEN is high (+5Vregulator ON) as in my case and I also run into this (or similar) problem. The AVDD supply pin is a very sensitive beast and need a capacitor 10nf..100nF. Place this capVERY close between pin8 and AGND!
I suppose the +5Vregulator (VREG/AVDD) is slightly ringing. The recommended 2.2uF is an additional need to supply the reservoir tank.
TEST: Listen carefully to the wired speaker (with NO input signal !) and the active channel. You must hear a clean noise (near rosa noise but very quiet) as heart from a FM radio set, when tuning stays between two radio stations and volume is very low.
Hope I could help.