A family of Microsoft relational database management systems designed for ease of use.
I - and many of my customers have exactly the same problem too.
This behavior occured since Office 2016/Access 2016 has been deployed. Before (with Office 2013/Access 2013) everything was fine, after upgrade to Office 2016/Access 2016 this behavior occur.
If you have Office 2016/Access 2016 and you also install the Access 2013 Runtime, and open your application with the Access 2013 Runtime, everything works perfect.
There must be a bug in Access 2016. I hope somebody of Microsoft will listen to this conversation - and solve the problem!