Object requested is currently locked by user WF-BATCH - questions 4.6c

[Rick Sample]

I have a Task with a Deadline timer that gets stuck inprocess sometimes.

I looked at SM58 and ST22 and don't see any issues. 
I manually set these to Ready and the WF continued executing. 
 
I have Deadline monitoring running every 3 minutes (in Dev client). 
Not sure why these Tasks were stuck or why they did not get picked 
up eventually by RSWWDHEX.
 
Any help is appreciated.
 
Thanks!
 
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