Thanks...
Anyway three drives are quite a lot for the original power supply, especially if you have the oldest one (the heavier ones); newer ones were supplied with A500+ and delivered 4,5A on 5V line (if not wrong).
The older ones 3A or less current.
Maybe a mix of reasons... (weak current lead to reduced voltage levels -> less noise immunity, etc.).
Thanks for greetings: I've been in Split this August for a week with 4 friends of mine (Strobec camping to be precise). ;-)