I've been getting a lot of

Listener for "Default": 26/05/2011 23:25:41, Unknown login xxxx.xxxx
Listener for "Default": 26/05/2011 23:25:42, Unknown login xxxx.xxxx
Listener for "Default": 26/05/2011 23:25:43, Unknown login xxxx.xxxx
Listener for "Default": 27/05/2011 00:23:06, Problems communicating with bitcoin RPC

for about two minutes and then it worked

Also is it bad that I kinda randomly stop my miner when I need the GPU? Does it hurt others in some way?