I have checked arerror.log and found that there is ARERR 552 is occuring continuously.
I will suggest to check your Network setting and Firewall configuration to check why Database connection is getting lost.
Also please provide Server side SQL and Filter Logs to Investigate more on your issue.
Please be sure to mark Correct or Helpful answer if you find my inputs useful.
the following error is thrown from the OS and recorded in the arerror.log - this is due to connectivity issues between AR > DB:
[DBNETLIB][ConnectionWrite (send()).]General network error. Check your network documentation. (SQL Server 11)
You should check out the following article if you are using Virtual Machines across your environment:
The change will need to be performed on the AR Servers.