Hi Ben
Thanks for your time and suggestion. Before I boxed this thing couple of years ago, it was flying fine with a steady heading. I have S3001 servos and FP-G154 gyro. The gain was always set at 7. For few seconds the tail is steady and then it goes back to it's wicked ways. At any rate, I will do a servo switcheroo and see what happens. If not corrected, Iam following your suggestions and replace both gyro and servo.
It's good to be back
Thanks again and happy landings.
Orson