How can i solve Wampserver random error 500 on requests

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i get random error 500 on a local server that has wamp. I don’t know what to do anymore to get rid of those random 500. I have the same app on a cloud server and it works perfect no error 500. For example in 2h with 30 devices i get like 30 error 500, with 60 devices i get 200 error 500 in same interval. What settings i should try? php and apache logs dont have any errors.