I have had this same problem with my RLC-823A. For the benefit of others who may have this issue, here's my fix.

Grip the lens/globe mechanism and physically move it up to its maximum (up) position. You might call it 'horizontal limit'. I might say its 'vertical limit' or maximum 90-degree position - camera pointing to the horizon. Then shut off the Auto-Reboot (which defaults to once a week on Sunday).

The problem has been whenever the RLC-823A reboots, it loses this reference position. It always returns to a lower angle, pointing further towards the ground. If you never need a preset that looks straight out to the horizon, this wouldn't be a problem. And you might not ever notice the issue - because all of your presets are based on this lower horizon reference. (That's the best I can explain it)

Note that if the camera is power-cycled, it will reboot, and you will have to physically move the camera mechanism back fully up to the horizon. Repeat as necessary.

I have installed the latest firmware v3.1.0.2831_23102509_v1.0.0.31 and I believe this might be a hardware problem that is affecting some of you (including me), since I'm replying to an old post which used older firmware, and they obviously have not been able to fix it that way.

I guess I'm stuck with the issue forever..