Thanks @jorgebri60 for your write up in referenced cross link. After reading all the symptoms you described I guess I'm pretty safe cause I don't show or have sensed that dead spot intensity only the normal slight drift when on the highway. Maybe it's the start of the issue maybe not never the less thanks again for the cross reference.
that's why I recommend having the update done regardless. Mine started like that. Felt like it was drifting. Especially at higher speeds. Can't hurt to do it. This update really dos work.