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MD12's have a common problem where they stop but by shorting two of the contacts they reset and start working again. Mine has done it once (in 25 years!). You should be able to Google up a proper explanation. The other thing I've found is the battery contacts can require cleaning if it's not used in some time. This is made difficult due to them being at the far end of the battery compartment. I tape a Q-tip to a pencil so I can reach them.
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