My DDX9903S has been flaky recently. The reverse camera view goes blank occasionally. My bluetooth mic has long stopped working. More recently the display mechanism broke after I hit it accidently. I removed the entire display while I try to fix it. If it can be fixed/hobbled together I'll consider keeping it but it looks like I'll need a new headunit soon.
If I replace but it still sort of works I can sacrifice it for science, to see how flashing it goes.
Not sure if the replacement will be another Kenwood.