WLAN 5Ghz not associated

A long time ago wlan 5Ghz is OK.
But it is not working anymore ( not associated ).
Maybe it was a software update ?
Bye
Marcus
Turris OS Version: 3.11.17
Kernel Version : 4.4.199-a890a5a94ebb621f8f1720c24d12fef1-0

The syslog is likely to yield some hint on futile association attempts from clients.

Systemprotokoll: no entry

Kernelprotokoll:
[8015645.864291] ath: phy1: Chip reset failed
[8015645.868401] ath: phy1: Unable to reset channel, reset status -22
[8015645.937150] ath: phy1: DMA failed to stop in 10 ms AR_CR=0xffffffff AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff

Could be a driver issue (most likely) or hardware issue, not really much to go on with that snippet.

You might want to consider https://forum.turris.cz/t/bug-reports-must-be-reported-to-technical-support-department-or-gitlab in order to get it sorted at the earliest.