Hi
I have the same problem with my S5, as a Cura Connect group host, that keeps disconnecting from Cura 4.3 and 4.4, but all my printers are connected on a gigabyte ethernet network.
Disconnection is mainly while Cura performs processor intensive tasks (saving a project, slicing, changing material, changing profile) but also occurs while Cura is idle.
Some weird informations on Cura 4.4, printer is said to be connected on the top left, but going to the printers tab, it is not marked as connected. Still it is possible to send the print to the printer by network.
I already have a bug opened on Github https://github.com/Ultimaker/Cura/issues/6626
This corrupts all the projects that are saved making this feature useless. It's a PITA.
Seems like 4.3 and 4.4 releases were done to deliver new features for the new Ultimaker products, but quality control and non regression was not a priority.
It's a shame for products that are targeting businesses.
Being a 3d printing service provider this has a major impact on my operations.