Sector Info changing rapidly

wAP 60Gx3 AP, Cube Lite60 station.
RouterOS 6.45.9.
I can see that the tx-sector and tx-sector-info values are fluctuating rapidly. Does this indicate physical instability of the unit(s)?

             connected: yes
             frequency: 58320
        remote-address: 48:8F:5A:88:97:6C
                tx-mcs: 1
           tx-phy-rate: 385.0Mbps
                signal: 20
                  rssi: -55
             tx-sector: 22
        tx-sector-info: right 1.8 degrees, down 1.2 degrees
              distance: 172.73m
  tx-packet-error-rate: 2%

             frequency: 58320
        remote-address: 48:8F:5A:88:97:6C
                tx-mcs: 1
           tx-phy-rate: 385.0Mbps
                signal: 100
                  rssi: -52
             tx-sector: 38
        tx-sector-info: right 1.8 degrees, up 0.4 degrees
              distance: 172.73m
  tx-packet-error-rate: 0%
-- [Q quit|D dump|C-z pause]
             frequency: 58320
        remote-address: 48:8F:5A:88:97:6C
                tx-mcs: 1
           tx-phy-rate: 385.0Mbps
                signal: 100
                  rssi: -52
             tx-sector: 38
        tx-sector-info: right 1.8 degrees, up 0.4 degrees
              distance: 172.73m
  tx-packet-error-rate: 2%
-- [Q quit|D dump|C-z pause]
             frequency: 58320
        remote-address: 48:8F:5A:88:97:6C
                tx-mcs: 1
           tx-phy-rate: 385.0Mbps
                signal: 100
                  rssi: -57
             tx-sector: 0
        tx-sector-info: left 2.6 degrees, down 2.6 degrees
              distance: 172.73m
  tx-packet-error-rate: 2%
-- [Q quit|D dump|C-z pause]
             frequency: 58320
        remote-address: 48:8F:5A:88:97:6C
                tx-mcs: 1
           tx-phy-rate: 385.0Mbps
                signal: 100
                  rssi: -55
             tx-sector: 21
        tx-sector-info: right 1.2 degrees, down 1.2 degrees
              distance: 172.73m
  tx-packet-error-rate: 1%

Looks like this is something that happens for 5-10 minutes following a reboot. Rebooted this 5 times now and the numbers fluctuate for a bit, then settle down.
Shortly after reboot:

A few minutes later:

This must just be normal for 60G stuff, then?

Yes, it’s normal:
http://forum.mikrotik.com/t/lhg-60g-experience/118643/583