Hello,
A dialog work processes enters "priv mode" when the Extended Memory (EM) is exhausted.
You can review the value of the parameter "ztta/roll_extension".
If it is set to a value close to the total EM configured, a singe user could consume the entire EM and all other users would instantly enter "priv mode".
You can also consider increasing the EM size (usually by increasing the parameter "em/total_size_MB". For this you should consider which other systems are running on this server (e.g., does the database also runs on the SAP server?), how much memory is allocated to these other systems, and how much memory (RAM) the server has installed.
Cheers!
Isaías