Upload of changes works only after several attempts

[MichaelFS]

What steps will reproduce the problem?

1. Open JOSM and create one or more changes, no matter whether on ode, way or relation
2. Click UPload

What is the expected result?

UPload should be accepted, a "SUCCESS"-message should be displayed.

What happens instead?

Message: Connection with Remote-Server
https://api.openstreetmap.org/api/0.6/failed.
Please check your Internet-connection.

Of course, the Internet-connection is stable and ONline. Nevertheless, I experienced such failures up to five times for one changeset.

The issue has been reported multiple times since January 2022 from several users in the German Forum [ ​https://forum.openstreetmap.org/viewtopic.php?id=74624]

Please provide any additional information below. Attach a screenshot if possible.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2022-04-04 22:26:00 +0200 (Mon, 04 Apr 2022)
Revision:18427
Build-Date:2022-04-05 01:30:55
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18427 de) Linux Manjaro Linux
Memory Usage: 292 MB / 7832 MB (143 MB allocated, but free)
Java version: 18.0.1.1+2, N/A, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.nimbus.NimbusLookAndFeel
Screen: :0.0 1920×1080 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: de_DE.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: de_DE
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: KDE
VM arguments: [--add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, -Djosm.restart=true, -Dawt.useSystemAAFontSettings=gasp]

Plugins:
+ buildings_tools (35978)
+ continuosDownload (99)
+ fieldpapers (v0.5.0)
+ reverter (35980)
+ terracer (35893)
+ undelete (35893)
+ utilsplugin2 (35978)

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/AddressValidator&zip=1