Possible timing issue?

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Running asterisk, and occasionally we’ll have a call drop and
the SIP retransmit error show up on the console. I actually think the
retransmit error is just a symptom of something else, possibly centered
around a timing issue.

I tried res_timing_dahdi and that worked for about a week, then suddenly
things went haywire and calls wouldn’t last for more than a few seconds
before being dropped. A restart didn’t help. I switched over to
res_timing_timerfd.so, and it seems to be working ok, but I’m worried
this will happen again after some time (it never seems to be immediate).
There is no dahdi hardware installed in this machine and… it’s
actually a VM. However it’s never really been starved for CPU or RAM –
the CPU barely goes above .5 load at peak and it hovers around .01 most
of the time, and it rarely swaps RAM out.

As there doesn’t seem to be any other error on the console when this
happens, I’m at a bit of a loss how to diagnose it further.