My client does crash since 3.0.17 (also 3.0.18 & 3.0.18.1)

Client 3.0.18.1 continues 'explodind' randomly, not as usual as it was with 3.0.17 but I have clients running in XP, Vista and W7 and they explode when they want.

I was clients running 24h/7days and it's a problem 'cause they stop randomly.

This didn't happen with 3.0.16.

My client does crash since 3.0.17 (also 3.0.18 & 3.0.18.1)