[Amps] Yaesu Quadra amp fault

[Max Cotton <M0GHQ@outlook.com>]

We have a problem with a Quadra amp, it cuts out intermittently after about 
30mins minutes use with a 'band mismatch ' error between the radio and the amp, 
can anyone suggest where to look or what the fault may be, this is in the 
preliminary investigation stage, up until a couple of weeks ago it was fine, 
nothing has changed set up wise.
73 Max M0GHQ
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