"Bumpy" noise after razoring audio clip

[SAM5FD8]

Hello, I've had this issue for a few projects now.
About half the time whenever I modify an audio clip using the razor tool or pan it, a odd "bumpy" noise occurs over the original audio. It almost sounds like a distant helicoper.

Is this simply me being me and doing it incorrectly or is this a bug I need to work around?

Thanks.

[SuiteSpot]

Can you post an example ?

Are you xfadeing any joins?