New FFB Issue on Alpha Body

I noticed a couple months ago that my a330, when first turned on, often comes back with the first frame being black and then performs normally. I did some experimenting and found that this happens only on the first frame after I've let the camera sit for at least a day or so. The shutter opens and closes as normal, but the mirror does not flip up. The mirror doesn't seem to move at all which makes me think that it is not a mechanical problem... it's almost as if the camera just forgets to flip up the mirror

Has any one else experienced any similar issues with an Alpha, or heard of this type of issue before? Thanks for your help.

It never progressed into a more serious problem? My a330 has about 5500 actuations on it. Right now just one black frame isn't so bad, I'm just fearful that it might be a symptom of some larger issue.

I've had it two or three times, with my A700. Had nothing to do with sitting unused though. It was usually in the middle of shooting. First time I noticed, I was in the middle of shooting geese in flight. I was shooting in bursts at 5FPS. In one of the sequences, I had once black frame. No, it wasn't underexposed or anything like that. It was completely black.

You know what I just realized... Sony probably knew all about this and decided to avoid it all together by making mirrors that don't have to move at all

Just for reference my A300 is 2 years old and I think it has like 35K or 45K actuations, don´t recall exactly,and I haven´t see this issue. I keep it on the shelf for 2 or 3 months without a click, when i use it again, everything was working as new.