A family of Microsoft relational database management systems designed for ease of use.
OK on further reflexion I've had a few more thourghts.
Access does cache SQL Server connections but maybe not Access BE connections.
For example, If I have a main menu that is unbound.
If the BE is Access and I return to the main menu, which is unbound, with no other forms open, or other users connected, the BE's laccdb is gone (or it should be) and I can call a proc that compacts the BE. Hence the connection must be dead. Although this issue suggests that these connctions may be accumulating which is out of character.
If the BE is SQL server then the connection is cached and I can't, for example, restore the SS BE until I fully close down MS Access to totally to clear the cached connections.
So obviously the two do not behave the same.
GIven that we have had similar issues like this late last year (OK it was jut last month, but that is officially last year) see https://support.microsoft.com/en-us/office/error-in-access-when-opening-a-database-on-a-network-file-share-6cbc1560-62c2-46e7-9980-d079a46f5acc
and we have had other issues with network connections in the last month or so involving Windows updates wihich may or may not be related
https://nolongerset.com/bug-alert-unc-alias/
And then throw in the "Monster Bug" issue that the Access Team have been working on for a few months, It sems likely that there are multiple factors obsfuckating [sic] network and ODBC connnections and my private and professional life generally.
So in summay - 'I've got nothing"! I'm pretty much clueless. Except to say - Don't subscribe to the Current Channel. pick the semi millenim channel or whatever the current binomial monemclature is for the whimps version, In fact Turn off automatic updates and only install builds manually that you know they are safe. I use a batch file to do this but you may be able to use one of the other methiods that did not work for me like the 365/Office Install tool or Group Poilcy Editor.
My Batch file (remember those) allows me to install a specific build known to be safe. It goes a little something like this...
C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe /update user updatetoversion=16.0.13801.20266
please feel free to provide me with furhter advice that may be offensive, condescending, useful, or not at all useful but nevertherless entertaining.