Weird HP-71B behavior...

[KF6GPE]

So, I have a few HP-71Bs (I never line them all up, so my wife is none the wiser). The one I keep at work has been flaky at best --- when I got it it had bad corrosion in the battery compartment, and I've mostly salvaged it. Once in a while it flakes out and loses its mind, but I pretty much use it only as a desktop calculator and as something to intimidate the young'uns at the office, so that's OK.

After grinding through some math the other day, I put it down without turning it off. The next day I realized it was locked up with the previous day's results and the CALC annunciator still on the display, unresponsive to keypresses. I pulled the batteries for a couple of minutes and held down the ON key for that time, put the batteries back in, and the LCD was showing the same thing, and it's still locked up.

Anybody seen anything like this? I pulled the batteries tonight before going home and will see tomorrow if it's fully self-drained and resets.