To me, given the elevator trim issues, then the roll to the right, it sounds like you may not of had a boom bolt installed correctly.  There are several  videos of this type of error on youtube.  If you did have it installed, maybe the mount where the blind nut is gave out.

If it were a radio issue it would make sense except the elevator trim issue leads me to believe a mechanical issue.  A lost connection or "hold" as they are called wont cause a trim issue.  It basically just does something uncommanded for a short time then stops if it gets signal back.