I have been experiencing loss of grid info for at least a week, maybe more. I have two machines, a 500 and a 250. The problem I'm having is that both machines are simultaneously resetting at least once every hour, and several times a day twice an hour, at around 3 or 4 minutes past the hour and half hour, I have most of my grid but Ch 11 & 13 seem to have a lot of "no listing". This is very perplexing and I was wondering if anyone else is seeing the same issues?
Could either or both of you check the "error re-set page" in the 753 menu to see if you are experiencing a similar reset? This could be the cause of your loss of grid info.
Just to add to my issues I had a 10 minute power outage yesterday (breaker tripped) and now my 500 has lost it's grid completely due to loss of zipcode & timezone data. This morning the zipcode was set but the timezone offset was completely wrong, so I might have grid back when I get home later.