Looks like same error both times:
SETI@home error -112 Unknown error
in seti_parse_data()
That function reads data from the workunit, which obviously it has been doing it okay until now, so I'd suggest maybe check the hard drive is not failing & scandisk it etc, and do general maintenance... Otherwise the WU file could have been damaged in transit, RAM gone bad, or any number of issues. So if problems persist I'd suggest some thorough maintenance and diagnostics, like a run with memtest86+ might be a good idea as well.
Jason