For ORA-03113 there may be a lot of possible reasons.
There are also a lot of SAP notes; I suppose you already went through 335199 and others?
The most serious problem I can see in your alert.log is this line:
ORA-00600: internal error code, arguments: [kghfrempty:ds], [0x9FFFFFFFFD3E0010], [], [], [], [], [], [], [], [], [], []
Let me suggest you open a support call, concerning this ORA-00600 message.