IKM please don't tell me you have these problems in RC5 :-)
Rest assured, I don't have them I just recall I saw that kind of stuff earlier, but it was very rare, after the device had a rather large uptime scattered across many suspends-wakeups. I took it for granted, as I've actually seen how crazy the Z kernel may be after much work, back when I tried compiling XFree natively with a swap and nfs working over a wireless connection %) The process always failed after a half a day or so, in a rather strange ways, wireless went dead, 'ps ax' locally showed a complete mess, and so on. That is understandable, since the original Z kernel was much of a hack, and nobody in Sharp cared about that kind of long-term stability anyway (it's pda, not a server). On a large enough timeline some smallish problem(s) can, little by little, triggering occasionally, make the device get to the point when it is no longer alive and kicking. And it is *completely* normal as long as it is really rare.
In case that particular problem reported by amrein is really quite frequent and annoying, it may be a bug. But in that case I would just say I've never experienced that *bug* at all
p.s. And no, I have never experienced these symptoms on RC5.