Change settings that Boinc can download WUs for 2 days.
On linux file lacation is /var/lib/boinc-client/global_prefs_override.xml
Set that:
<work_buf_min_days>2.000000</work_buf_min_days>

Follow my post to copy and paste content.

https://fightdeppresionbyscience.wordpress.com/2017/12/31/config-file-for-boinc/