Product Variation

Hi All

I am having issues with production variation. If i click on generate variations I get that circle in the middle as if something is loading…. nothing then happens. If I click on save, exit the product and then go back into the product, one variation appears. This is the same for adding a variation manually.

Does anyone have a resolution to this?, I have products that can have 150 variations. It has only happened recently and I haven’t added any new plugins.

Many thanks

Jon