My sonar quits working (page basically stops scrolling) when I exceed approx 10mph. Depth won't register and bottom disappears. Resumes like normal once I slow down. Brand new unit just installed so it may be a setting adjustment that's needed?? Transducer is in same position as last unit (HDS 9 Gen 3) and that one worked great. (so I doubt it's a transducer location issue)

Quick update that might help with problem solving-I have the Active Imaging 3 in 1 transducer mounted on the outside of the hull.

You did the unwritten no-no of posting in two subforums simultaneously. You should pick one, wait for answers, and only if you don't get any, try elsewhere. You clutter the forums for those who are reading/helping. I already told you what's wrong on the other post.