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I've resolved this. I ended up doing a factory reset of the Sonic Pad, and then doing another re-levelling. This solved the issues. It must have been something within the Sonic Pad because I did 3 other levellings and those didn't fix the issue. I don't use the Sonic Pad for anything other than remotely watching the print via the camera, and remotely sending print jobs to it, and remotely monitoring it. So it wasn't a configuration issue.
Oh well, at least the Factory Reset fixed the issue. Back to doing a 3D print.