My 982-537 (two axis) has two 'AA' batteries inside. There is a battery indicator that comes on when they are low/dead/missing so I don't think this issue is related.
You might have a damaged solder joint or something that 'fixed' itself as things warmed up, but in the case of a bad joint it's not really fixed of course and you'll see it again.
As long as the problem stays gone I wouldn't do anything, but if the problem does recur I'd open the box and check the board for broken / cracked solder joints. If you have good eyes that's often better than high magnification - the shallow depth of field that accompanies magnification can obscure joints that are lifting. You can also try a cold spray or even canned air to selectively chill parts of the board, under power, to see if you can make the problem recur.
GsT