1st impression: It disconnected just half an hour after upgrading to the test version. But I did not reconnect after updating because it appeared to be still connected and first tests also indicated that.
So, now I have reconnected yet again with the test version and wait and see what happens.
That is really unfortunate. Maybe one last attempt from my side:
a) Do your devices stay connected and just stop responding? you can check this in the Alexa app. If there is a button with “Click to diconnect” visible, then this is the case and you are still connected.
b) If red triangles are displayed in the devices, then the Alexa app should have lost the connection.
If a) is the case, you are probably one of the users who still have the problem. Bad luck.
In b) I would delete the existing devices and create new ones with the test version.
In the configuration I see only the configuration dialog, almost as if nothing had ever been configured before.
I can run through the dialog (provide my password again which will fetch a new token), and yes, this will re-enable my devices temporarily.