Hi,
Just for information, I have discovered the latest version of firmware for ShellyVintage lamps makes the lamp unusable [Blockierte Grafik: https://smarthome-forum.eu/images/smilies/emojione/1f922.png] .
Indeed, the lamp first seems to work okay 
, but after a few hours, the lamp becomes completely network unresponsive 
.
Pings fail, curl requests fail 
.
Even rebooting the lamp power off/power on fails to make the lamp responsive 
.
Resetting the lamp to factory defaults puts the lamp in working condition again, but only after numerous off/on pulses to the lamp, without any logic (you just have to watch until the lamp comes back again in factory default with (smartphone) wifi scanner, 192.168.33.1, you know).
A work-around 
is to then flash the lamp with previous firmware version 20200827-065016/v1.8.3@4a8bc427 again, after which the lamp works flawlessly again 
. I put all my ShellyVintage lamps back to the previous firmware.
I did it using the guidelines provided on the firmware archive page on this site. (that is great work, you guys!)