Does your transparent wire go to earth?
I had one of these in a multi-master tool.
I ended up replacing the package with three discrete capacitors, in your case 0.027uF, 2x 2700pF
But (unless they are doing something strange) this is not a motor capacitor, just a suppression capacitor, so it may not be your problem.
unless the capacitors are jusr breaking down with the higher voltages of full speed.
If it is just suppression capacitor, you should be able to remove it (temporarily) to see if your problem persists.
Or permanently of you don't see any ill effects on radios/TVs around you.
So you need (assuming I read your part number right):
a 0.027uF 275V (or higher) X1 rated capacitor between blue and black,
and a 2700pF 250V (or higher) Y2 rated capacitor between Blue and transparent,
and a 2700pF 250V (or higher) Y2 rated capacitor between Black and transparent.
That should replace the unit.
I'll try to find links to suitable components when I get into the office if you need me to.
Rgds
Jon