CC2652 pairs but can't connect devices afterwards

Hey there

I set up my pi4 and a cc2652 coordinator before and that worked well.
Now I wanted to upgrade my system with an solid state disk.
So I installed everything from the scratch. I had to repeat the pairing for most of my devices multiple times but that didn’t really seem odd to me.
Eventually I got them all paired.
After moving the pi to the server rack (where it was before without the ssd too) I could not control my devices because there was no connection.
In the zigbee2mqtt devices tab it said n/a as signal quality.
So what could here have gone wrong?
I am a bit clueless I have to admit…

Did you stick your coordinator in the same USB port as it was before? Otherwise you should change your config

serial:
  port: /dev/*********

to wherever your coordinator is pluged in.

I did a complete fresh install. And if that adress was wrong I wouldn’t be able to pair new devices, would I?
It is onmy after the pairing when I can’t access them if they are not right next to the coordinator.

Silly me, I totally missed that one :).
Another option to try would be, to move your coordinator away from the rack / SSD / other devices (and router, if nearby) with an extension cable to avoid interference with other components. I had to move my coordinator app. 1 meter away from the Raspberry to assure good signal.

No, unfortunately that didn’t solve the problem.
So obviously the ssd makes the difference. Running the same hardware from sd card worked well and gave a good signal quality. Running from ssd makes it really hard to pair (takes really many attempts) and completely looses connection once there is a certain distance between coordinator and device.
So the question is: is this hardware- or software related?
Concerning the hardware I figured a powered usb hub may help. But the ssd is already powered and the pi power supply proved to be enough in the sd card setup.
Concerning the software I am not sure if there are any additional setups to be done when ssd and coordinator are to work simultaneously on the usb ports.

Is it a USB3 SSD? Guess so…
There are a lot of reports of USB3 creating interference for, e.g., zigbee radio on RPI.

I personally re-purposed an older RPI3 for zigbee and Bluetooth, and put it away from wifi, “main” RPI4 and other interference sources, and I don’t have any issue anymore.

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Did some research on usb3/ssd issues on the pi. Wasn’t aware of that at all. If I had known earlier I would have saved the money for two ssds…
Anyway. Thinking of buying an odroid n2 now.
I just want to have hardware that won’t cause any problem…