Test the diverter in diagnostics to see if it moves, or if it's stuck like Frax suggested.
If it actually works in test, then you're just not making that shot when it diverts to the Borg ship. The two times this happens are either when lock is lit at the ramp, or anytime during Borg multiball.
The visual static is probably the high voltage components on your DMD driver board going bad.
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Display_problems
If you get a ColorDMD, it doesn't use the high voltage driver.