Power Wedge or MUX Issues

[stl greg]

Power wedge on my 2009 wakesetter 23 lsv sometimes goes down (deploys) right after turning on batteries or sometimes right after I start boat.  Sometimes power wedge down button screen (right side MUX) is blank even though I can read all other functions (wedge up, deploy wedge, heater on/off etc). When wedge down screen is visible it sometimes looks like I am pushing button as it is hi-lighted with black outline (while I am not pushing button).  Other wedge functions seem fine.  Do I just have a right MUX switch problem or something else?  I replaced my left MUX a few years ago but that is because LCD screen could not be read.  Buttons still worked fine, I  just couldn't read the screen.  Has anyone else experienced anything like this?  This past weekend, I checked all my grounds under dash (on ground block) and they all looked very clean and were all tight.  I also unplugged MUX switch and plugged it in again with no changes.  Same inconsistent problem, though it happens often.