This could be caused by almost anything, overloaded server (your or ours), network congestion, network dropouts, etc, etc.
Let me guess, when it doesn't work it returns the fixed costs? How are you sure that this isn't caused by the same intermittent problem?
I don't think there is much I/we can do for you really ... the log files don't indicate any server issues, we haven't had any other reports to indicate that it is a server issue, the code hasn't changed any, so it is currently looking like it may be an intermittent problem with your server, or worse, one of the routers inbetween your server and ours.
This kind of issue needs to be fault found from your end of things.
Cheers
Rod
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