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This is why I tell friends to buy good test equipment. I use a Fluke 179 and a Simpson 260 7P. Both are well over $200 each but come with quality test leads and connections.
Now I realize, I use my meters constantly not just for occasional troubleshooting on the "A", but you do get what you pay for. Price aside, I also keep all connections clean with Deoxit contact cleaner. Don't bother with other junk as it usually doesn't work.
I also recommend when you grab a multimeter always set it to ohms and short the leads. You should get almost a 0 ohm reading even if you move the leads around in the meter sockets. Then you know your leads are good to go and the meter is responding. If the meter jumps around when you twist the plugs in the sockets on the meter then fix it. Don't just twist them around until they seem to work, you'll end up sorry later.
Deoxit D5 :
http://www.amazon.com/Hosa-D5S6-Deox...eywords=deoxit
They also have a formula which is designed for protecting contacts, comes in handy on the "A".
http://www.sweetwater.com/store/deta...89202644&SID=1