I'm getting some odd (and usually random) lines come into my long-running android apps. Unfortunately I'm running Android Kitkat and I don't have some of the standard Android profiling and monitoring tools available. Also unfortunately, upgrading the OS isn't an option because it is bundled with this rather nice hardware that has an integrated barcode reader and GPIO ports.
Have you run across weird screen stuff like this before? What could be causing it? Is there a way to force garbage collection or clean the screen?
Edits: Also, we are running Teamviewer on the devices and these black marks show through on Teamviewer. Could teamviewer be the culprit?