RNG150 resets video resolution every night

I have an old 1080i tv connected via component cables to an RNG150 cable box.  This has worked trouble free for years.  About a month ago, I lost signal to the tv.  I discovered when I plugged in a computer monitor to the hdmi port, that the cable box had gotten set to 1080P.  So, I disabled "use the best available resolution" and manually set the box to 1080i.  It worked.  The next day, no signal again.  Checked with the computer monitor, and the "use best available" option was still disabled, but the resolution had changed back to 1080P ignoring the  auto change being disabled.  Everytime I fix the resolution, it works for the day.  The next day, it's been reset to 1080P yet again.  I also tried a second RNG150 I have and it's doing the same thing. 

I'm also occasionally getting hdcp screens on the component output.  Since analog component does not support hdcp, I'm not sure why it's refusing to show me content.  The same channel works later in the day.

Was there a firmware update in the past month that broke manually setting a resolution? Having to drag my computer monitor from another room (and mess with cabling behind my desk) is getting very annoying.  Anyone know of any tricks to keep the box from not using my configured settings?