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I have read multiple threads of user issues .
Whilst I accept Pie is not perfect I honestly have few issues .Granted I'm not currently using SD storage.
RN5 Pro came out the box with Miui 9 Nougat and I wonder how many users dirty flash overwrite system OTA without a thought to the accumulative effect this may have .
Factory resetting before and after major updates is often good housekeeping to eliminate some issues