Luke - 1 hour ago »
Biggles - 37 minutes ago »
My friend has a 9300 and is not suffering the problem you are seeing. What you are seeing suggests your machine is doing a Default Setting all on its own but I have no idea why.With a default setting it also wipes out the tuning.
And replaces it with new tuning that in the short term will probably be exactly the same as that that has been wiped. Unless the OP had made drastic changes to the channel line up he probably wouldn't notice if a retune had taken place.