Hi Carmen
Your images are beautiful, and to have uploaded nearly 15K is a fantastic achievement given the stress you have had (I can identify, very similar circumstances).
I too have had 3 recent QC failures after having only 1 in 11 years, but I've not exactly been prolific in uploading until recently. 2 uploads were I feel due to a lens issue, not worth repairing, but the failure today for SoLD is my fault I'm sure, maybe I've become complacent and careless, and need to tell myself to be more critical and 'professional'. Not saying at all this is your issue but it is mine.
I have every confidence that you will identify what's causing your QC issues, don't give up!
Best wishes
Elaine