I am facing problem with oracle 11g database,

i am continuesly inserting data to oracle database after some time like 2 hours oracle disconnects,it creates erros like

ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Process ID: 0
Session ID: 0 Serial number: 0

after restarting the database with shutdown immediate ans startup if i start inserting records it will show erros like

ORA-01653: unable to extend table SYSTEM.GLT_PROT_TRAFFIC_SUM_VOIP by 8192 in tablespace GLCOMM

but i have created the Tablespace with BigFile Auto Extend and max size unlimited, i am having 400GB disk space created Redo logs with 15gb,i have tried serveral times reinstalling the oracle but problem is not solved.

same problem is happenging with small datafiles also,

operating system: windows server 2008 R2 standard

oracle server : 11g

oracle client : 64 bit

Can you please any one suggust some solutions to fix this problem.
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