So I got around to getting a new digitizer (screen) and replacement battery for an ancient iPhone and got them installed.

Question for those who've replaced digitizers...

Any ideas as to why the screen will behave as if its being touched in a bunch of places without actually being touched?

Its not all the time, maybe 2 or 3 times in a day. All I have to do is turn off the screen and wait a few seconds.

This is the second digitizer I've replaced but the first time I've had this issue. Mostly just curious if there someone more technically inclined/experienced with an answer other than guessing.