Teams messages do not arrive in the desktop app

[Marcus84]

We have some problems with the receipt of messages in the Teams client (first occurrence on 5. Dec 2022).

Error pattern:
Messages arrive too late in the desktop version.
Unfortunately, the problem occurs sporadically. 
Messages arrive in the web version as well as on the smartphone.

Possible solutions so far:
Logging out and logging in to Teams
The cache was deleted
Restarts (system, not only Teams) do not help either
Teams was reinstalled

Any other ideas? 

Thanks in advance.

Kind regards

Marcus

[#2]

It is a bit less info what operating system. what install of teams etc.
Do you install it yourself or is it done from packages 

Network is there a proxy etc

[#3]

Hi Paul.

Operating system is Windows 11.
And Teams was downloaded from Microsoft source and installed again. No proxy is used.