Annoying Tap Tap sound plays in the background at random.

After flashing Dirty Unicorn rom in Moto g XT1033 I am facing a weird issue. A tap tap sound plays in the background like I am adjusting volume. It happens at random. So to get rid of the bug I wiped the Rom and restored the nandroid backup of previously installed Rom. Now the problem is it still persists. I then switched to Exodus rom still this issue persist. Can anyone help me with it?

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