I have a ronin-M and ive been happy with it. Im having issues with trying to keep the main frame aligned with the handle.. It wants to align tilted quite a bit to the side when i turn it on. Its properly balanced. Photos show what i mean.. I have to hold the handles and tilt it to the side for the gimbal to be perfectly straight

Have you tried calibrating the center or calibrated the system in general in the Assistant Software? Is the tuning stand level? Did you notice this after a firmware update or long term storage?