Disconnects every few minutes. Happens on 6 different systems.
(The 'specs' I give are at least the minimum for the 6 comps.)
And, forgot to mention this before, on 4 of the machines all using an ISP bundled bandwidth monitor the monitor pops up at random but with different intervals.

Re: the RAM comment... Don't think so... 1GB RAM and 2GB 'Virtual'.
Plus, this occurs with no real action with BS... i.e. not D/Ling, not U/Ling, not an Ultrapeer... Average Hosts bandwidth normal low (Ah, good old BearShare !)... Not searching. No other stuff happening with the exception of anti-virus/security running - and being active here in GF.
Task manager with a nice LOW almost level graph.

Know what you mean about the extended run time and RAM, but that's not applicable here as none of the comps are 24/7 and the disconnects start within minutes of launching BS.

4 of the comps are running straight ADSL modems... 2 with routers but both of them are single comps per router.

Last for now, the 6 machines are all connected through fairly widely spaced (geographically) exchanges. And the ISP is NOT a heavy cop type... No caps, no port locks - wide open.