[AFMUG] Trango Apex Issue

[can...@believewireless.net]

Twice a year for a few weeks we have a Trango Apex 11GHz link that acts up.
Here is what we are seeing:

Side 1:
# linktest
        LOCK       RSSI          MSE            BER             TX
     RX
  1>     0      -43.40 dBm      -7.70 dB        0.00E+00        QPSK
     QPSK

Side 2:
# linktest
        LOCK       RSSI          MSE            BER             TX
     RX
  1>     1      -45.00 dBm      -34.30 dB       0.00E+00        QPSK
     64QAM

Any idea what could be causing this? We saw something similar on Giga 11GHz
links as well.