Hi Ian and Phil,
Log files sent by both of you indicate that http intermittent error has occured, server request is getting timed out. This generally occurs in case of bad network or when network is throttled.
Generally in such cases "retry" (running AUSST in "Incremental Synchronization" mode) should help. However, since this issue is coming again and again for some of you, we are further looking into this.
Regards,
Sumita