Quick question for you all: How do you deal with a problem in production that you cannot fix, even over an extended period of time (say 2 months)?

For context I feel like I’m losing my sanity here, we’ve had this problem on our production API since the beginning of March this year. I’ve done so much testing, got in contact with various teams of my company to try to figure out any potential candidate that would explain the bug, but none worked out. No need to say I’ve spent a considerable amount of time searching on the internet for others with the same problem or similar… We’ve even opened a ticket with the cloud host to see if they would have more details about the problem without success. So how do you deal with that ?