Here is a simple guide to fix QuickBooks connection has been lost
                     Learn to fix the ‘QuickBooks 
Connection Has Been Lost’ 
Error

The users can encounter the "QuickBooks Connection Has Been Lost" error while 
opening their company file or working on a QuickBooks desktop. When QuickBooks 
software loses connection to the company file, the users can see this error popping up 
on their screen. The software might close immediately due to the error. Another 
important thing the users should note is when they come across this error; any unsaved 
data will not be recovered. They will have to renter the data. Go through this blog to 
understand the causes behind this error and learn some suitable methods to fix it.  
Is the "QuickBooks connection has been lost" error troubling you? Do not 
worry. You can now call us at 1-855-856-0042 and get some assistance from 
the experts. They will help you with some instant methods to rectify this 
error. 
Causes Behind The "Connection Has Been Lost in 
QuickBooks Desktop" Error 
A "connection has been lost in QuickBooks desktop" could be caused by 
corrupted data in the company file.
A network error can occur if your company data file is on a removable storage 
device.
Also, a connection error can show up if you have numerous QuickBooks versions 
installed.
Users using a stand-alone system can encounter the error for the following 
reasons.
A damaged or corrupted company file may cause a connection error.
If the company file requires additional rights, the error can show up.
Any antivirus program that prohibits you from accessing your QuickBooks desktop 
can lead to a connection error in QuickBooks desktop. 
Methods to fix the QuickBooks network connection 
failure error  
Refer to the methods below and implement them on your screen to rectify 
the QuickBooks network connection failure error.  
Methods 1: Check your network 
To confirm access, open a different file saved to the server.
Make a document in Word or MS Excel, then remove it.
Verify whether Word or Excel allows you to add or remove files.
Attempt to configure the Windows permissions required by QB. 
Method 2: Use the QuickBooks tool hub 
 
On your computer, download and install the QB tool hub.
Open the downloaded file.
To complete the installation, follow the on-screen instructions.
After the installation is finished, double-click the tool hub to start it.
Pick program problems from the QB tool hub.
Select the Quick fix my program option and give it time to run.
Check if the error has been rectified.
If the error is still not fixed, try running QuickBooks file doctor from the tool hub. 
Winding it up here!  
We have come to the end section of our blog and have listed methods for you 
to rectify the "QuickBooks Connection Has Been Lost" error. If you feel 
stuck in any of these methods, you can contact us at 1-855-856-0042. We 
have a group of QB experts who can quickly help you fix this error.