I have a weird problem I can say. I'm using Magento 188.8.131.52, and SOMETIMES, NOT ALWAYS, when I want to access the product page, of any product, it gives me an 404 page not found error and if I refreshed the page, goes to the product page without any 404 error. I don't know why is that. This happens only one time/2-3 days for me, but I guess it happens more often, because I have many visits on my website. What could be the problem?Thank you!
See if your issue is related to the latest "Known issues" for magento installations. They mention it for the version above yours, but it does not mean that the issues originated in that version specifically. There is also a solution with cache disabling mentioned in this ticket. That may help. Good luck!