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A comment on Is Catalina a Good Upgrade Yet?. Parent comment
Run the built-in hardware test, extended version. If it finds any fault, take it straight in for service. https://support.apple.com/en-us/HT201257
If AHT shows no errors, clean install macOS. As in, wipe it totally, and reinstall. This is tedious but I expect Apple support will recommend it anyway. And if you've already done it, it might save time.
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Run the built-in hardware test, extended version. If it finds any fault, take it straight in for service. https://support.apple.com/en-us/HT201257
If AHT shows no errors, clean install macOS. As in, wipe it totally, and reinstall. This is tedious but I expect Apple support will recommend it anyway. And if you've already done it, it might save time.