Samsung Galaxy S6 does a weird static glitch in the memo app?

I use the memo app a lot, like pretty much everyday on my phone. And every so often I ve noticed that when I m in the memo app writing a note, on a certain part of the screen it ll just look static-y for a few seconds and like the screen will jump once when it happens. From what I ve noticed, it only happens in the memo app when I m writing, and only lasts a few seconds. It happens every so often, and I just wanna make sure nothing s wrong with my phone because I had an iPhone 4S and the whole screen would go static and jump and stuff and when I called to replace my phone they said something was wrong with it internally. So I just don t want the same thing to be wrong with my Galaxy because it s pretty new, I ve only had it for a few months. So is this static thing just like a common glitch in the memo app? I don t want anything serious to be wrong with my phone, and I don t want anything to be wrong with the app that ll cause me to lose all my memos, because that also happened to me with my iPhone. I would take a screenshot of it when it happens, but it happens too fast and I never know when it s gonna happen.

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