I have recorded 3 at the same time, but also have had the yellow (or sometimes purple) screen you mention, Not always when recoding 3 channels either.
I have recently disconnected the ota from my 622 and i have not seen the yellow screen since. BTW the yellow screen appears on the non-ota as well as ota channels, and i get satellite lost (i.e on a sat channel) if the ota signal is low or lost.
what is your OTA signal like at these times ?
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