[Yaesu] MD100 does not always key FT-920

[Dave]

I have no problem keying evertime with my Heil Pro and the hand mike. But, the MD100 is a different story. The MD100 will key the radio for from 5 to maybe 100 times without a problem. Then it will stop keying the radio. To get it to key again I have to remove the MD100 and key the radio one time with either the hand mike or the Heil and then reconnect the MD100 and it will key again just like before it stopped. I have looked at the MD100 and can not see anything wrong with it. I have cleaned the contacts and blown out the mike itself. When it is working, nothing I can do will make it stop. Any ideas to get this mike to work all the time?

Thanks,
Dave N0EOP