Shelly 1 hops wifi connection

[Schuim]

This one dazzles me a little bit. At the moment I have 3 devices laying around for a while now, in some sort of bricked mode after OTA flashing of Tasmota.

• OTA flashing, All seems to go well.
• Connect to the wifi network the device creates.
• Fill in the wifi credentials of the home network and press connect.
• Device shows up on it's original Shelly IP in the routers overview but disappears for a second or two sometimes, and shows up again, seems to be reconnecting.
• Try to hard lock the IP with the same IP adres as static, and the device completely disappear being nowhere to be found again.

Was thinking I screwed up, so left the devices laying around.

So the Black Friday sale was on so I decided to give it another try.

Trying to flash a new one OTA.
Everything goes as it should.
Ends up in the same hopping behavior.

Blocking the IP by using an other device on that IP makes the device also completely disappear.

Meanwhile I upgraded to a new router, so I'm trying to find out if its really me.
Connection is full strength.

Side note. I have two functioning in my network for a while.
Any ideas?