Get a lot of errors in Phex

[Comrade Fidel]

After working flawlessley for a while, I'm suddenly getting a lot of errors in Phex. Every ten seconds or so I get the following error:

050908 00:02:43,0326 Error/Global:: (Global)! Exception occured: java.lang.UnsupportedOperationException
at phex.upload.UploadState.setTransferRateTimestamp(U nknown Source)
at phex.common.TransferRateService$SetTimestampTimer. run(Unknown Source)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)

Phex is also causing my PC to suddenly reboot without warning after running for a while.

My basic step:

3GHz CPU, 1 GB RAM
Windows XP Pro
Java 1.5.0_04-b05
Phex 2.6.4.89

1,473 files shared (34.13 GB)

I allow up to 20 parallel uploads, maximum upload bandwidth of 250 KB/s. Max 99 download connections, 99 downloads per file, 10 Mbps limit. javaw.exe usually uses around 100MB RAM, no significant CPU utilisation, but quite a lot of HDD access.

Any idea?

Cheers,
Fidel