Hi Rao,
If possible try to share Operating system Event logs (Application as well as system),also kindly confirm have you updated kernel release from 700 to 720 ?
Also from the SM21 logs one suspect message of Network breakdown is showing i.e
Operating system call recv failed (error no. 10054)
This error code relates with Network issue at your end.For this i recommends you to follow SAP Note 559119 - Call disconnections in the syslog or dev_rd
Also one small check to trace the issue is to check the uptime of Network by selecting status of Network adaptor (Here you'll get from how many days or time connection is up). Kindly share the details for same.
Hope this will help you to trace out the exact network issue at your end.
Regards,
Gaurav Rana