My boat has the blinds between the double window panes so they do not move during vessel operations. Do you do anything special with yours when underway?
The plastic clips are a PIA as they break very easily....only a few have survived on the windows that aren't near traffic or are raised and lowered a lot.
On a few window corners where my rot was so bad the plastic retainers couldn't be used...I screwed "P" clips for electrical cable into the bottom of my "clamp" style aluminum window frames with the one leg free so it can grab the bottom of the blind...looks good and works great.