If you ever use the gps, try turning your music on. Test that it will always drop the gps signal with music on. Then e-mail and call HTC like crazy about this issue until they either replace our phones or if it's a software issue then release a patch.
EDIT: Since most people started flaming me, I will post more information to validate this error. It seems to be external speaker related, as far as I can tell using headphones will not cause any problems.
Major BUG with GPS and audio playback possibility - xda-developers
My problem with posts like this are the "OMG MAJOR FLAW" thread titles. If you don't want to be flamed, don't douse yourself in jet fuel & dance around a campfire.
This should have been in the troubleshooting section. There are thousands of software interactions that could have caused this problem for you. It could have been a matter of installing a program that caused the problem that you are experiencing. Restore your phone completely, make sure both OTA's are installed & then use the stock music & stock navigation to see if the issue persists.
Personally I do not have the issue on my Evo. I am not rooted currently & have about 120 apps on my phone.
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