Something has changed with my 80m tuning. Ant is Butternut HF6V and rig is an IC-7410. Of course the vertical has always had a rather sharp SWR curve and ran about 2.5:1 at 3573 kHz. The internal tuner in the Icom handled it just fine. Similar story down at 3.501. Antenna SWR curve is centered around 3.530 or 3.535. All that seems typical and worked out well for me. But now the tuner can't seem to do anything at all with 80m, even at the sweet spot of 3.530. It just goes searching around even with a dummy load. Of course the first thing I checked was the antenna. All seems ok, sweet spot and hi/lo swr points are pretty much the same as they have always been. Now I'm wondering if something has gone on the fritz with the internal tuner. I can get the SWR down well with an external tuner and my outboard SWR meter agrees with the Icom's SWR meter but if the auto-tuner is engaged it just goes nuts. I seems to recall something about the rig holding tuner settings in a memory but I cannot find any details on this. I wonder if a Factory Reset is needed to get a blank slate again? or if there is an actual failure in the tuner circuitry? Anyone else have any similar experience?