I was just reading the manual that came with my new flash and stumbled over this warning:
14.3 Flash capacitor forming
The flash capacitor built into the flash unit undergoes physical change if the unit is not switched on for a prolonged period. For this reason it is necessary to switch the unit on for approximately 10 minutes at least once every three months.
Is this seriously a problem? How long does a flash have to sit idle before it has issues?
What kind of issues would I see? Slower recycle times? Inability to recycle? Total failure to power on?