As there are no recent posts on this interesting theme, I have to say that the GSM shield recently bought, has a zener diode soldered in parallel to the problematic capacitor. So, I think this kinda solve the problem.
As there are no recent posts on this interesting theme, I have to say that the GSM shield recently bought, has a zener diode soldered in parallel to the problematic capacitor. So, I think this kinda solve the problem.