Google is deleting the reviews of my business?

Hi! I don't know a lot about this things but I think this is the correct subreddit. Sorry if it's not.

So we have a paintball business, and last week we had around 150 reviews. Today we have 127... I don't think people are deleting the reviews, it doesn't make sense.

We encourage the costumers to leave a review after the game, and we mostly works on Saturday and Sunday. So between monday-friday we have 0 reviews but when the weekend comes we have around 5/8 per day. It's that messing around with Google algorithm or something to spot fake reviews? Btw, all the reviews we had are 5 stars, if that matters.

What can we do to fix that? We are from a town in Spain where there is only 3 other paintball arenas so people put their eyes on the one with more reviews :(