whether unstable cases can be fixed

hi, I have issues looking for help.

1.Below website was broken for several days.
Is anybody to fix it?

http://buildbot.w1.fi/hwsim/tests.php

2.some cases are unstable
For example:
p2p_service_discovery_external
I run this case on Debian for 40 times, and fail 2 times, all of other 38 times are pass.
I wonder whether the instability can be fixed. 