[ARKIT] Stabilize/set anchors

Currently working on a project with AR using the ARSample as a base. But are there any best practices? It seems my project always ends up with “stutters” and sometimes my actors will even start drasticaly moving in any direction.

Is there a way to make usage of a static anchor or how should I go ahead to prepare my playing field better? I tried putting papers with colors/text on them but it keeps stuttering.