Maybe these article can be helpful:
Master Note for Forms FRM-92050, FRM-92100, FRM-92101, FRM-92102 Reference Guide (Doc ID 444690.1)
Master note on Known Causes of FRM-92102 Error in Forms (Doc ID 756369.1)
FRM-92101, FRM-92050, FRM-93552 and FRM-93000 Error When Running Forms After a Relatively Small Number (50 - 80) of Concurrent Connections and No New Connection Possible (Doc ID 187455.1)
Also, ensure all required 10.1.2.3 forms patches are applied to the environment:
Oracle E-Business Suite Release 12.2: Consolidated List of Patches and Technology Bug Fixes (Doc ID 1594274.1)
The issue resolved by the network team after Netscalers has persistence enabled with 1440 for the timeout.
I'm new to Opera. Could you please tell how exactly you got this solved. I'm also getting this error message.