One day I can get a lot accepted then the next, very few. I have done nothing different so surely this has to be down to the individual reviewer?

There was a time not that long ago that I decided to delete an accepted image because I wasn't happy with the category I had put it in. When it was reviewed again, it got rejected. How can that be if it was accepted 1st time round? Surely there must be a level of fluctuation in taste or quality control for that to happen on Adobestock?

Just to be clear this is not a dig as I know Adobestock have a thankless task. However it's a legitimate question to evaluate if others find that there is a big variation in a level of acceptance from one day to the next.

(For people who want to have a go at me submitting AI generated images, I do submit regular images too!)

Sorry, but all this is the case for more than 18 years with real photos. Produce good images, and this will not happen. I never complained myself about rejections for 18 years!
You should try doing something else then instead of AI generating, something where you have got a skill, or maybe spend time and work to get a skill.

Btw, feel free to show the rejected images here. Usually, people don't do it. Guess why... 

Did you read the bottom of the post?

Don't understand your comment I'm afraid.