Hello. I have installed SXT Lite5 ac instead of SXT Lite 5 and have a bug.
When Channel width 20/40/80Mhz Ceee Band 5Ghz-only-AC is selected Tx Rate is dropping from 780Mbps to 6Mbps all the time with packets losts.
When I use 20/40Mhz Ce 5Ghz-only-AC then Tx Rate is dropping much seldom from 360Mbps to 6Mbps.
No Tx Rate dropps are only when using Band 5Ghz-only-N 20/40Mhz Ce.
I have uploaded the video illustrating this bug.
I used also Freq.Usage and Scan tool to check for interferences. But all is clear.
RouterOS and firmware versions are 6.42.1 on both SXT Lite ac.
Same is on RouterOS 6.40.8.