do you see any "receive version message: /Shibetoshi:0.1/: version 70002, blocks=0, us=[::]:0, them=[::]:0, peer="
in your debug.log files?
what wallet use Shibetoshi?
IIRC that's an old Doge wallet, I think their latest is 1.8 by now and that doesn't connect to the bitcoin network anymore. Not sure why they did to begin with. Is there an IP associated with that entry?
2015-02-06 09:12:35 receive version message: /Shibetoshi:0.1/: version 70002, blocks=0, us=[::]:0, them=[::]:0, peer=218.61.196.200:38926
from Shenyang, Liaoning, China
Maybe I'll test it again as it could be both wallets running at the same time?
About the shutdown maybe the screen saver on XP has some thing to do with a forced shutdown?