Hello, I have the same problem when running a simulation with ESFR sprinklers, sprinklers are connected to a dryline with a retard of 60 seconds, when water is discharged begins the problems with particle 1 and finish on particle 5. I´ve changed the PARTICLES_PER_SECOND from 5000 to 20000 and the Jet Stream Offset from 0.05 to 0.1, wich is the mesh length.
After running the simulation again I have a lot of warning messages from particle 1 to particle 1307, just the same like you.
Did you fix this problem?
Regards!