Have a 3.851 V1 and have read all of these reports about an 'E' message. (Had it only a month)
What does one look/sound like when it hits? Is it persistent until you shut off the detector?
I've had some sporadic signals that I can't ID exactly. They are so short that I don't get a good look at the detector before it stops. Out of the corner of my eye it looks like an upper case E and it has a European police siren sound (hi low repeating).
Maybe it is laser, but I would think Laser would last longer and I would be able to see the "L". I've only been hit by laser 2 or 3 times ever, so a laser hit would be unusual -- unless there are some of those laser cruise control vehicles around my 'hood.
Detector works great and the arrows are well worth the money. Can't believe I've had a detector of one kind or another for 20 years and didn't have arrows.