The process got signal 11 means your computer is basically too busy. If you are running 8 concurrent CEP2 tasks you have probably overloaded your disk I/O causing this error. Try cutting back on CEP2 to fewer tasks, maybe 5 or 6 CEP2 and 2 or 3 something else. CEP2 can be very disk intensive.

Cheers

24 threads concurrent... yup that is a suspected root cause. Particularly the startup phase, when it unpacks about 6700 reference files and copies them to the task slot and constructs the model from the given parms is highly demanding. With BOINCTasks [3rd party multi client manager], you can observe the Elapsed time and CPU time side by side Just with a few concurrent on my 4770 I see minutes pass before actual computing begins. The more start concurrent the tougher it becomes for storage to keep up. If you'd be in a position to config a RAMdrive of say 24-30GB, and run BOINC off that, you'd have a winner [UPS helps to not lose anything if your area has wobbly grid power]

Recommended is also a BOINC exclusive partition on HD/SSD, ideally an exclusive drive all together with large caching capacity.

Anyway, there are many threads on the do's and don'ts in this forum how to optimize ["Leave Application in Memory when suspected" a must take option in the BOINC preferences].