Horizontal lines appear when using Apple Pencil on iPad while charging

Question

While charging my iPad Pro (running iOS 14.0) from my MacBook, using a Syncwire lightning cable, random horizontal lines appear when I draw using my Apple Pencil. Has anyone encountered this problem, or have any advice on how to fix it?

Many thanks in advance.

Answer 1

I seem to have found a solution to my own problem, so posting it here in case others have the same issue.

I have been charging my iPad from my Macbook, which was also charging at the same time. As soon as I remove my Macbook from its power source, the issue disappears. It seems that the AC power entering the Macbook was somehow interfering with the iPad!