Tasks running on infinite loops (Linux/AMD CPU)

Hi - 

I recently acquired a teeny Lenovo machine that I'm using to try to crunch some WUs. Here is the host page. I've allowed BOINC to use 100% of the CPUs, 100% of the time (i.e. running 4 tasks concurrently). I don't use the computer for anything else. Here's my problem: only one task seems to be able to run to completion at a time. The other 3 keep restarting before they reach a checkpoint.

The relevant specs are that it's powered by a 2c/4t AMD Athlon Silver 3050e, with integrated Radeon graphics (which are not detected by BOINC); it has 4 gigs of RAM (not upgradable); 8GB swapfile; and it's running Lubuntu 20.04 LTS (my first linux distro - a nightmare).

Here is some typical output from the event log for an active task:

Fri Jan 21 06:06:21 2022 | Einstein@Home | [task] task_state=QUIT_PENDING for LATeah1088F_184.0_28365_0.0_0 from request_exit()

Fri Jan 21 06:06:21 2022 |  | request_exit(): PID 2395 has 0 descendants

Fri Jan 21 06:06:22 2022 | Einstein@Home | [task] Process for LATeah1088F_184.0_28365_0.0_0 exited, status 0, task state 8

Fri Jan 21 06:06:22 2022 | Einstein@Home | [task] task_state=UNINITIALIZED for LATeah1088F_184.0_28365_0.0_0 from handle_exited_app

Fri Jan 21 06:07:23 2022 |  | [slot] removed file slots/2/init_data.xml

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/hsgamma_FGRP5_1.08_x86_64-pc-linux-gnu__FGRPSSE (input)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/einstein_S5R6_1.01_graphics_i686-pc-linux-gnu (input)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/fftwf-wisdom_FGRP5_1.08_x86_64-pc-linux-gnu (input)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F.dat (input)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/JPLEPH.405 (input)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F_184.0_28365_0.0_0_0 (output)

Fri Jan 21 06:07:23 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F_184.0_28365_0.0_0_1 (output)

Fri Jan 21 06:07:23 2022 |  | [slot] removed file slots/2/boinc_temporary_exit

Fri Jan 21 06:07:23 2022 | Einstein@Home | [task] ACTIVE_TASK::start(): forked process: pid 2496

Fri Jan 21 06:07:23 2022 | Einstein@Home | [task] task_state=EXECUTING for LATeah1088F_184.0_28365_0.0_0 from start

Fri Jan 21 06:11:54 2022 | Einstein@Home | [task] task_state=QUIT_PENDING for LATeah1088F_184.0_28365_0.0_0 from request_exit()

Fri Jan 21 06:11:54 2022 |  | request_exit(): PID 2496 has 0 descendants

Fri Jan 21 06:11:55 2022 | Einstein@Home | [task] Process for LATeah1088F_184.0_28365_0.0_0 exited, status 0, task state 8

Fri Jan 21 06:11:55 2022 | Einstein@Home | [task] task_state=UNINITIALIZED for LATeah1088F_184.0_28365_0.0_0 from handle_exited_app

Fri Jan 21 06:12:56 2022 |  | [slot] removed file slots/2/init_data.xml

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/hsgamma_FGRP5_1.08_x86_64-pc-linux-gnu__FGRPSSE (input)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/einstein_S5R6_1.01_graphics_i686-pc-linux-gnu (input)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/fftwf-wisdom_FGRP5_1.08_x86_64-pc-linux-gnu (input)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F.dat (input)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/JPLEPH.405 (input)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F_184.0_28365_0.0_0_0 (output)

Fri Jan 21 06:12:56 2022 | Einstein@Home | setup_file: projects/einstein.phys.uwm.edu/LATeah1088F_184.0_28365_0.0_0_1 (output)

Fri Jan 21 06:12:56 2022 |  | [slot] removed file slots/2/boinc_temporary_exit

Fri Jan 21 06:12:56 2022 | Einstein@Home | [task] ACTIVE_TASK::start(): forked process: pid 2502

Fri Jan 21 06:12:56 2022 | Einstein@Home | [task] task_state=EXECUTING for LATeah1088F_184.0_28365_0.0_0 from start

Why are my tasks issuing request_exit() commands? What does "exited, status 0, task state 8" mean? How can I fix this? 

(Note, since another task completed last night, this task has now started checkpointing and is no longer quitting).

A few days ago I aborted three tasks that were stuck in infinte loops. Here is the stderr output for one of them. Note it never reached a checkpoint during computation: 

read_checkpoint(): Couldn't open file 'LATeah1088F_88.0_8862_-5.3e-11_2_0.out.cpt': No such file or directory (2)

Appreciate your help!