Is the version you have 15.7 SPS 130? Because your config looks like our customer's config.
The same "stack size" 94298(default) and the same "stack guard size".
I guess in the errorlog you have that message "stack guard size' has been modified from '19456' to '20480' by the verification routine."
On my laptop (ASE 15.7 SPS 122) I have
------------------------------ -------------------- -----------
esp execution stacksize 65536 0 65536
stack guard size 19456 #1340 20480
stack size 73728 #4824 73728
and not a single word in the errorlog that it was "modified from '19456' to '20480'" or at least I couldn't found it.
Anyway, I'll be at customer tomorrow and want to increase "stack size" and check if this will help.
I just thought that as per ASE doc the default value is 4096 then 20480 is a bit to much and they can easily get that "stack overflow kpid ....." when running sp with txt as a param and even (maybe) sp_sysmon.... but if the doc is old when just need to increase the "stack size" and hope and pray ( 
) that it will help 