I had intermittent problems like this where I also lost instruments functions. It turned out to be defective ABS controller which I believe was causing fault on CAN bus. Fortunately, it was replaced under warranty; but it took almost 2 months for my dealer to get a replacement part from Japan and this was after escalating the issue as high as possible, because I said (and my dealer agreed) this was a safety issue.
Hope your outcome is different; but I doubt you will able to diagnose by yourself and just want to warn you not to go replacing a bunch of parts before you get complete diagnosis.
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