There’s a nasty bug if you are running ASM on Solaris SPARC where the DB and ASM can crash if its been up for more than 248 days.
This seems to only affect Solaris SPARC as its a bug in the compiler. Patches are available from 10.2.0.4 to 18.104.22.168. No patches available for 12c at the moment.
Patch and details can be found in Metalink Patch 10194190