Well... THANK YOU ALL GUYS.
Let me tell you a little more... 

As someone said, there are corruptions occurring here and there, but until
now I was under the impression that this was caused by shocks (physical
shocks, people hitting the feeder, dogs anxious to eat*, etc) but in the
light of the newly damaged (not working any more) RTC I started to think
about ESD, which I didn't consider at all in the first place... My fault,
yes, but the be fair I didn't originally know where was the board going to
be placed...

Anyway, I will try to get a spark generator and test a few things. I don't
think ESD is getting in trough the pushbuttons, they have a 5~7 mm plastic
insulation...plus the insulation of the pushbutton (it has a custom made
cup).
On the other hand I don't know about the ESD properties of the 7 segment
displays, so I will investigate that way. In fact, now that I'm thinking,
the board is very close to the plastic itself on the edges (1~2mm) and there
are some traces going near the edge... 

Well, I'll take a look at that and will post any conclusion I encounter.

Thanks again to all.

Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
info@janso.com.ar
www.janso.com.ar
(54) 11 - 4542 - 3519

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