Have you tried the fixed on tuner b and motorised on tuner a?
You get that when you haven't a got free tuner. So either 1/ Two recordings are taking place and you trying to access another channel, thus giving you the error message. 2/ Someone else is accessing your box!?!. 3/ One of your cables is flakey.
I would suggest looking at your cabling, f-connectors etc first. Even snipping some cable off n reapplying f-connectors etc.
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I use vix ABM and still have the problem, i must have been doing it all wrong for years, never had this before. with respect i would have to be thick to not know when i'm recording on 1 or 2 tuners.
Plug out the network cable, does it happen then?