Online Shop SERP dropp

Hi Guys,

I run an online store 2 Languages. I did uploaded 1.5k new products via CSV and after 3 days all my keywords dropped in the serps for 5 - 10 positions.

What should be this? Any Idea?

I very much doubt it would be anything to do with that.

It's never happened to me before and that's how I upload my new products.

Do you outsource your SEO work at all?

If so have you asked them?