Hi,
Thanks for PM me and sorry that it took this long to notice but I'm working on this problem now. This seems to also affect out throughput.
This seems to be related to the upstream resending old work which leads to high fragmentation in the work they send to us which in turn increases the packets in our work units.
The error -131 means the output file is bigger than what we accept. Since more packets mean bigger files, that'll explain why we've now hit this limit. I've increased this limit for new work we generate and next I'll see what I can do with the existing work that keeps failing. (These will eventually fail permanently but that can take some time so I'd rather get them fixed or aborted centrally.)
-w