After upgrading from 0.2.9.xx to 0.3.0.xx (stable versions from torproject repo for debian) I noticed the following problem with tor client. If tor is not actively used during many hours, it fails to construct new circuits, but old circuits still can be used. I see from netstat that it has few new connections established, but getinfo circuits-status shows that no new circuits are constructed. Any application has connection timeout if I try to use it with tor. To fix the issue I have to restart my tor.

First time my "long live" old circuit was youtube. Next time it was XMPP connection. In both cases I had just one circuit. So, basically, I leave my tor running for night, but at morning it cannot make any new circuit. However, already established circuits continue to work. May it be some interference with ISP preferences? I don't know. But it looks like a tor problem, because according to netstat new connections are got established by tor.