Thermal breakdown on an Apple II CP/M card

[cschroed@hercii.lasc.lockheed.com (Curt Schroeder)]

I have been using a CP/M card (i.e. Z-80 card) on my Apple for the past 8 years.
It is now evident that something on the card is suffering from thermal breakdown
(works for a few minutes after power-up, and then crashes in strange ways).  I was
wondering if anyone knew if the culprit was usually any particular chip (like the
Z-80 CPU itself) before trying to swap any parts (easy to do, since all the chips
are socketed :-)  ??

Thanks in advance for any lessons learned!

Curt 
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Curt Schroeder                        | cschroed@hercii.lasc.lockheed.com
Lockheed Aeronautical Systems Company | marylynn@netcom.com (1st prefered)
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These opinions are mine, mine, mine!  |    --- Apple II Forever! ---