RDP Topic:
My educated guess is that you are running out of 3040 resources. Try to keep your streaming to 320 resolution and not full screen.
Unified Communications: Zoom, Teams, and more
The 304 does not have enough resources to provide a very usable Zoom or Teams session with video. In fact, the Administrators Guide states:
Unified Communications support on Wyse 3040 Thin Clients
The following features are not supported on Wyse 3040 Thin Clients due to client resource limitations:
● Video call or meeting
● Share screen
To avoid audio choppy issues during the audio call or meeting, users are recommended not to perform the following tasks:
● Move the application window frequently or quickly.
● Scroll down the Microsoft PowerPoint slide, Word document, Excel sheet, or a website page frequently or quickly.