• MicroTik 4011, Ubuntu 20, Intel Wifi driver crashes on 5GHz
• Change from 20/40/80MHz XXXX to 20/40/80MHz eeeC - problem solved

[   59.729745] iwlwifi 0000:03:00.0: Microcode SW error detected.  Restarting 0x2000000.
...
[   59.733957] iwlwifi 0000:03:00.0: FW error in SYNC CMD PHY_CONTEXT_CMD
...
[   59.734763] iwlwifi 0000:03:00.0: PHY ctxt cmd error. ret=-5
[   60.285388] iwlwifi 0000:03:00.0: Failed to send MAC context (action:2): -5
...
[   60.285420] wlp3s0: failed to insert STA entry for the AP (error -5)