For the comma-versus-decimal-point thing, it sounds like you just need to set flag 28, although I don't know why it would be getting cleared with a MEMORY LOST since it comes out of reset with flag 28 set.
Rarely (maybe once or twice a year), my own 41cx halfnut doesn't want to turn on when I press the ON key. Although I've never looked inside, I understand there's a little bridge PC board that handles the built-in time module (which I use all the time) plus the power-control circuitry and maybe the display too, and apparently the contacts are getting a bit bad. I bang the side of the calc on the heel of my hand and that always brings it back; but since the power to the time module was interrupted, I have to set the time and date again. However, the last time I got the dreaded "MEMORY LOST" message was when I was new at synthetic programming (using the byte grabber) in the late 1980's. I've had the programs that I use most in it continuously for 25 years, never having to re-load them (although I have edited them for improvements).
I wonder if your other problem is with the Survey module and not the calculator itself. If not, and if you can't figure it out and don't want to try fixing it yourself, Bruce Larrabee has a repair service at http://www.vintagecalculatorrepair.com/index.php
. There was also Randy's repair service at http://fixthatcalc.com/
but he is temporarily turning away new repairs until he can get caught up. His website says he expects to be ready Jan 1, but there's no update yet, now two weeks later. (I have these links and many others in the HP-41 section at the bottom of the links page on my website shown in my signature line.)