Thank you very much Geoffrey and Sapna for the massive help,
I have reduced the number of published services (they are less than 30 services at the moment) with 1 and 2 as min\max number of instances per machine (pooling). The problem disappears.
By the way, is there a way to count the number of ArcSoc.exe? I assume that there counts shouldn’t exceed 80 as the number of cores of our server is 16 (16*5 = 80).
I’ll be reporting if the error appears in the future
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Jamal Numan
Geomolg Geoportal for Spatial Information
Ramallah, West Bank, Palestine