Hello Guys
I have exaclty same problem, after a random period of time new systems can no be discovered. All discovery task are finishing with error- "system does not respond to snmp" which is false.
Did you got any workarounds for this except restarting hp sim service?
I am in the same situation can not update to version 7.3 because of IRS(no contract and warranty status in hp sim, why?!!). I have a case opened at but it seems that they do not know what they are doing... for 2 months.