Databases going in recovery mode
In error log it's saying: FCB open failed: could not open file
  "\sharepath" for file number 1 OS error: 32 the process cannot access
  the file as it's being used by another process


System account has issues with accessing database files on network share 

Can you, perhaps, try this?:


grant full access of [domain\serverName$] to
\\sharepath\sharefolder where database files resides
trace if there any open handles to those file, that prevents database to be started